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Security

· 12 checks — HTTP headers, CSP, TLS handshake, and cookie hygiene rolled into one auditable list.
SCORE
77
GRADE
C
FIX
2
REVIEW
4
PASS
6
INFO
0
Checks
12
6 PASS 4 REVIEW 2 FIX
F
Subresource Integrity
Action
0 of 56 external resources have SRI
FIX
0 of 56 external resources have SRI
Warning::
External link from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/css/c80b6d5df76f4fed.css
Warning::
External link from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/css/aee94819ec53bc3a.css
Warning::
External link from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/css/9a571d7532d4e4df.css
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/polyfills-42372ed130431b0a.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/webpack-8767f01905a85f62.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/framework-9ab5fe1e97350b85.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/main-8114cb73924c51cd.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/_app-8f250bde26208f54.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/bf32f307-9ede5c4e981eede4.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/598-117a90455c61f74f.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/6453-20776eb252c5a865.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/9587-f16dec59c09755f2.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/6421-0e596f44ea3d16c5.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/9935-51de23a318d826f7.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/3670-accdfd6af81d146c.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/4906-a06fe8b664d888ce.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/1910-a79cd563ead45183.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/1544-7fc196795dee2439.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/5799-ce29778674be5b92.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/8918-7f5289c3eb723f2a.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/7997-a38fd6065ff2783c.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/5074-7f4feee881c2c059.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/9479-e94951f3d260c54e.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/index-b3b4f1f12f566054.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/D31ePvlDEXwOO2pIhf1bV/_buildManifest.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/D31ePvlDEXwOO2pIhf1bV/_ssgManifest.js
Warning::
External script from cdn.optoutadvertising.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.optoutadvertising.com/script/sf/base.min.js
Warning::
External script from cdn.optoutadvertising.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.optoutadvertising.com/script/sf/hostOptOut.min.js
Warning::
External script from cdn.optoutadvertising.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.optoutadvertising.com/script/ootag.v2.min.js
Warning::
External script from adcdn.ster.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://adcdn.ster.nl/script/nos.homepage.min.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/816-16c073b709e265dc.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/201-e1bb75e7e2525895.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/330-50dec0415b42bef2.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/1637-108ff637650fc635.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/nieuws/%5Bcategory%5D/%5B%5B...params%5D%5D-485526f5cd2fa3d8.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/9272-465df72432469c3c.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/3219-d2c3e40140d72488.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/7376-d7a5a10d7b447ee3.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/6649-dd879fd23ef20471.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/4124-96f7d2b7fb046208.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/5798-9068d6e5e7b07025.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/1081-8910fc1424091f4d.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/5689-fc25ab36933921d1.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/5840-169d3616cbcfc2c6.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/2832-3d6fa3c96e0ace28.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/2095-8b994b4d8cda8dd6.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/6342-d576b862fe5453f6.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/item/%5Bslug%5D-36e4e7858a0b0eaa.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/live-26cf66b0921bbf86.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/sport-aa487421ab2cb058.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/nieuws/laatste/videos-b35e406e47099bf0.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/nieuws/laatste-9b432efda9c3a848.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/5570-53f178cae351dfe9.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/nieuws/regio-30e50d9daedaa143.js
Warning::
External script from cdn.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.nos.nl/assets/nosnl/6bf4e31523fce2f86266c6f0560b31ac952c9171/_next/static/chunks/pages/zoeken-db9043167c580620.js
Warning::
External script from cookies.nos.nl lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cookies.nos.nl/sites/NOS/nos.nl/ccm-wrapper_v1.1.js
SRI Coverage 0 / 56 of external resources have integrity hashes
TagDomainIntegrity
<link>cdn.nos.nl✗ Missing
<link>cdn.nos.nl✗ Missing
<link>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.optoutadvertising.com✗ Missing
<script>cdn.optoutadvertising.com✗ Missing
<script>cdn.optoutadvertising.com✗ Missing
<script>adcdn.ster.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cdn.nos.nl✗ Missing
<script>cookies.nos.nl✗ Missing
D
Permissions-Policy
Action
No header set
FIX
No header set
Warning::
No Permissions-Policy header
Consider adding a Permissions-Policy header to restrict browser feature access from embedded content.

No Permissions-Policy header set.

Without this header, embedded iframes can request access to sensitive device features.

Suggested header
Permissions-Policy: camera=(), microphone=(), geolocation=(), payment=(), usb=()
C
Security Headers
Action
4 of 10 headers properly configured
REVIEW
4 of 10 headers properly configured
Warning::
HSTS is missing includeSubDomains
Without includeSubDomains, subdomains can still be accessed over HTTP.
Got: max-age=31536000 Expected: max-age=31536000; includeSubDomains
Info::
X-Content-Type-Options is properly configured
Got: nosniff
Warning::
X-Frame-Options header is missing
This header prevents clickjacking by controlling who can embed your page in a frame. Set it to DENY or SAMEORIGIN.
Expected: DENY
Info::
Referrer-Policy is properly configured
Got: same-origin
Warning::
Permissions-Policy header is missing
Controls which browser features (camera, microphone, geolocation) are allowed. Set it to restrict unused features.
Expected: geolocation=(), camera=(), microphone=()
Info::
Content-Security-Policy is present
Got: frame-ancestors 'self'
Warning::
Cross-Origin-Opener-Policy header is missing
COOP isolates your browsing context, preventing cross-origin side-channel attacks. Set to 'same-origin'.
Expected: same-origin
Warning::
Cross-Origin-Embedder-Policy header is missing
COEP prevents loading cross-origin resources without explicit permission. Required for SharedArrayBuffer and high-resolution timers.
Expected: require-corp
Warning::
X-Powered-By header reveals technology stack
This header discloses server technology (e.g. Express, PHP), helping attackers target known vulnerabilities. Remove it.
Got: Next.js
Info::
Server header is present without version info
Got: nginx

Without includeSubDomains, subdomains can still be accessed over HTTP.

Expected: max-age=31536000; includeSubDomains
Why this matters

Without includeSubDomains, a forgotten dev subdomain over HTTP can set malicious cookies that ride to the apex.

Learn more ▾

HSTS without includeSubDomains protects only the exact domain. Cookies set on a non-HSTS subdomain can ride to the apex via cookie-scope attacks. The fix is one directive append. Verify all subdomains support HTTPS first — adding includeSubDomains to a domain with HTTP-only subdomains breaks them.

Source: RFC 6797

This header prevents clickjacking by controlling who can embed your page in a frame. Set it to DENY or SAMEORIGIN.

Expected: DENY
Why this matters

Without frame protection, your site can be embedded in a hostile page and used for clickjacking.

Learn more ▾

Clickjacking overlays your site under a transparent malicious page so users click invisible buttons. Setting X-Frame-Options: DENY (or a modern frame-ancestors CSP directive) blocks the embedding entirely. There's almost never a legitimate reason to allow it.

Source: OWASP / MDN

Controls which browser features (camera, microphone, geolocation) are allowed. Set it to restrict unused features.

Expected: geolocation=(), camera=(), microphone=()
Why this matters

Permissions-Policy locks down browser APIs you don't use — without it, every page can request camera/mic/geolocation if XSS lands.

Learn more ▾

By default every page can request the camera, microphone, geolocation, payment APIs, and dozens more. Permissions-Policy turns off the ones you don't need so a future bug can't quietly start using them. It's a defense-in-depth header — one line, big surface reduction.

Source: MDN / W3C

COOP isolates your browsing context, preventing cross-origin side-channel attacks. Set to 'same-origin'.

Expected: same-origin
Why this matters

COOP isolates your top-level browsing context from cross-origin windows — without it, popup-based side-channel attacks remain possible.

Learn more ▾

Cross-Origin-Opener-Policy: same-origin prevents cross-origin pages from sharing a browsing-context group with yours. This blocks cross-window references that enable Spectre-style timing attacks and tab-nabbing. Required if you want to enable SharedArrayBuffer.

Source: MDN / web.dev

COEP prevents loading cross-origin resources without explicit permission. Required for SharedArrayBuffer and high-resolution timers.

Expected: require-corp
Why this matters

COEP enforces that all embedded resources opt-in to cross-origin embedding — required for cross-origin isolation features.

Learn more ▾

Cross-Origin-Embedder-Policy: require-corp ensures every embedded resource (script, iframe, image) explicitly allows being loaded cross-origin. Combined with COOP, this enables the cross-origin-isolated context that unlocks SharedArrayBuffer, high-resolution timers, and other powerful APIs.

Source: MDN / web.dev

This header discloses server technology (e.g. Express, PHP), helping attackers target known vulnerabilities. Remove it.

Why this matters

X-Powered-By: PHP/7.4.3 advertises your stack to attackers — disable it.

Learn more ▾

X-Powered-By and similar headers (X-AspNet-Version, X-Runtime) tell attackers which versions to target. Disable in your server/framework config: PHP `expose_php=Off`, ASP.NET `<httpRuntime enableVersionHeader="false">`, Express `app.disable('x-powered-by')`.

Source: OWASP

B
Content Security Policy
2 of 10 CSP checks passed
REVIEW
2 of 10 CSP checks passed
Info::
Raw CSP policy
Got: frame-ancestors 'self'
Warning::
default-src directive is missing
default-src provides a fallback for other directives. Set it to restrict default resource loading.
Expected: default-src 'self'
Info::
No script-src or default-src to check for 'unsafe-inline'
Info::
No script-src or default-src to check for 'unsafe-eval'
Info::
No script-src or default-src to check for wildcard
Info::
object-src falls back to default-src
Warning::
base-uri directive is missing
Without base-uri, attackers can inject a <base> tag to hijack relative URLs. Set it to 'self' or 'none'.
Expected: base-uri 'self'
Info::
frame-ancestors directive is set
Got: frame-ancestors 'self'
Warning::
form-action directive is missing
form-action restricts where forms can submit data, preventing form hijacking.
Expected: form-action 'self'
Info::
upgrade-insecure-requests is not set
This directive upgrades HTTP resources to HTTPS automatically, preventing mixed content.
Expected: upgrade-insecure-requests

default-src provides a fallback for other directives. Set it to restrict default resource loading.

Expected: default-src 'self'
Why this matters

Security gaps expose your site and users to attacks, eroding trust.

Without base-uri, attackers can inject a <base> tag to hijack relative URLs. Set it to 'self' or 'none'.

Expected: base-uri 'self'
Why this matters

Missing base-uri in CSP leaves a base-tag injection attack path open even on otherwise strict policies.

Learn more ▾

A common omission: developers add CSP for script-src and frame-ancestors but forget base-uri. The result is a CSP that looks strict but lets an attacker rewrite every URL on the page via <base href>. Add `base-uri 'self'` to close the gap.

Source: MDN CSP

form-action restricts where forms can submit data, preventing form hijacking.

Expected: form-action 'self'
Why this matters

Security gaps expose your site and users to attacks, eroding trust.

This directive upgrades HTTP resources to HTTPS automatically, preventing mixed content.

Expected: upgrade-insecure-requests
Why this matters

Without upgrade-insecure-requests, any HTTP subresource link survives as a mixed-content warning instead of auto-upgrading.

Learn more ▾

Adding `upgrade-insecure-requests` to your CSP turns every http:// subresource fetch into https:// at the browser layer. One-line defense against accidental mixed content from legacy links or third-party widgets.

Source: MDN CSP

Parsed Policy

frame-ancestors 'self'
B
CORS Configuration
No CORS headers
REVIEW
No CORS headers
Info::
No CORS headers present — secure default
CORS Configuration ✓ Secure

No CORS headers detected.

Cross-origin requests are blocked by browser same-origin policy.

Origin reflection test

Some servers mirror the request Origin header, which can be exploited. Test manually:

curl -sI -H "Origin: https://evil.com" <url> | grep -i access-control
B
security.txt
Published with 1 contact(s)
REVIEW

security.txt

Contact: mailto:informatiebeveiliging@nos.nl
Expires: 2026-08-31T22:00:00.000Z
A+
TLS & Certificates
TLS 1.3, 7 checks passed
PASS
TLS 1.3, 7 checks passed
Info::
TLS 1.3 is used
Got: TLS 1.3
Info::
Strong cipher suite is used
Got: TLS_AES_128_GCM_SHA256
Info::
HTTP/2 is not negotiated
HTTP/2 provides multiplexing and header compression for better performance.
Got: http/1.1
Info::
Certificate is valid (expires in 53 days)
Got: 2026-06-13T23:59:59Z
Info::
Certificate chain has 3 certificates
Info::
Certificate uses modern signature algorithm
Got: SHA384-RSA
Info::
Certificate covers 1 domain(s)
Got: nos.nl
Info::
Certificate is issued by a trusted CA
Got: CN=Sectigo Public Server Authentication CA EV R36,O=Sectigo Limited,C=GB

HTTP/2 provides multiplexing and header compression for better performance.

Why this matters

HTTP/1.1 forces the browser to make sequential requests, multiplying latency on every page.

Learn more ▾

HTTP/2 (and HTTP/3) multiplex many requests over a single connection, eliminating head-of-line blocking. HTTP/1.1 forces the browser to either queue requests or open many parallel connections — both worse. Most modern web servers support HTTP/2 with one config line.

Source: MDN Web Docs

Connection
Protocol
TLS 1.3
Cipher Suite
TLS_AES_128_GCM_SHA256
HTTP Version
HTTP/1.1

Certificate Chain

Leaf Certificate
Subject SERIALNUMBER=32142157,CN=nos.nl,O=Nederlandse Omroep Stichting,ST=Noord-Holland,C=NL,2.5.4.15=#131450726976617465204f7267616e697a6174696f6e,1.3.6.1.4.1.311.60.2.1.3=#13024e4cIssuer CN=Sectigo Public Server Authentication CA EV R36,O=Sectigo Limited,C=GBValid 2025-05-13T00:00:00Z → 2026-06-13T23:59:59ZExpires in 53 days SANs nos.nlSignature SHA384-RSASerial 301451f58f86804a42a9d0eac76784f6
Intermediate (CA Certificate)
Subject CN=Sectigo Public Server Authentication CA EV R36,O=Sectigo Limited,C=GBIssuer CN=Sectigo Public Server Authentication Root R46,O=Sectigo Limited,C=GBValid 2021-03-22T00:00:00Z → 2036-03-21T23:59:59ZExpires in 3622 days Signature SHA384-RSASerial 6d4f7cad335377c8c6e001dde2e2c88e
Intermediate (CA Certificate)
Subject CN=Sectigo Public Server Authentication Root R46,O=Sectigo Limited,C=GBIssuer CN=USERTrust RSA Certification Authority,O=The USERTRUST Network,L=Jersey City,ST=New Jersey,C=USValid 2021-03-22T00:00:00Z → 2038-01-18T23:59:59ZExpires in 4290 days Signature SHA384-RSASerial d27fbbc1de359e5216ad6149586099c4
A+
Cookie Security
No cookies set — no cookie security risks
PASS
No cookies set — no cookie security risks
Info::
No cookies set — no cookie security risks

No cookies detected — no cookie security risks to report.

A+
JS Library Vulnerabilities
No known vulnerabilities
PASS
No known vulnerabilities
Info::
No known JavaScript library vulnerabilities detected

No known JavaScript library vulnerabilities detected.

A+
Information Leakage
No exposures
PASS
No exposures
Info::
security.txt is present — good practice
Info::
No sensitive files exposed

No sensitive files exposed — all paths returned 404.

PathStatusCategoryRisk
/.git/HEAD✓ Not foundVersion Control—
/.git/config✓ Not foundVersion Control—
/.svn/entries✓ Not foundVersion Control—
/.env✓ Not foundConfiguration—
/.env.local✓ Not foundConfiguration—
/.env.production✓ Not foundConfiguration—
/wp-config.php✓ Not foundConfiguration—
/.htaccess✓ Not foundConfiguration—
/phpinfo.php✓ Not foundDebug—
/server-status✓ Not foundDebug—
/server-info✓ Not foundDebug—
/.well-known/security.txt✗ ExposedSecurity PolicyInfo
A
Email Security
DMARC: quarantine
PASS
DMARC: quarantine
Info::
DMARC policy is quarantine — good protection
DMARC
Policy quarantine — good protection Record v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc_agg@vali.email,mailto:dmarc-reports@nos.nl; ruf=mailto:dmarc-reports@nos.nl
A
Transport Security
HTTP/3, HSTS, and TLS version analysis
PASS
HTTP/3, HSTS, and TLS version analysis
Info::
HTTP/3 (QUIC) not advertised
HTTP/3 eliminates head-of-line blocking. If your CDN supports it, consider enabling it.
Info::
HSTS enabled (base policy)
Info::
HSTS missing includeSubDomains
Without includeSubDomains, HSTS only protects the exact domain.
Info::
TLS 1.3 in use (fastest handshake, 1-RTT)
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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