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Security

· 12 checks — HTTP headers, CSP, TLS handshake, and cookie hygiene rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
1
PASS
6
INFO
0
Checks
12
6 PASS 1 REVIEW 5 FIX
D
Security Headers
Action
3 of 10 headers properly configured
FIX
3 of 10 headers properly configured
Info::
Strict-Transport-Security is properly configured
Got: max-age=63072000; includeSubDomains; preload
Warning::
X-Content-Type-Options header is missing
This header prevents MIME-type sniffing, which can lead to XSS attacks. Set it to 'nosniff'.
Expected: 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
Warning::
Referrer-Policy header is missing
Controls how much referrer information is sent with requests. Set to 'strict-origin-when-cross-origin' or stricter.
Expected: strict-origin-when-cross-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: default-src 'self'; base-uri 'none'; connect-src 'self' https://*.amplitude.com …
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: Vercel

This header prevents MIME-type sniffing, which can lead to XSS attacks. Set it to 'nosniff'.

Expected: nosniff
Why this matters

MIME sniffing lets browsers run uploaded files as JavaScript, turning a file upload into an XSS.

Learn more ▾

Setting X-Content-Type-Options: nosniff tells browsers to trust your declared Content-Type instead of guessing. Without it, an attacker who uploads a polyglot file can sometimes get it executed as a script. One header, no downside.

Source: OWASP / MDN

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 how much referrer information is sent with requests. Set to 'strict-origin-when-cross-origin' or stricter.

Expected: strict-origin-when-cross-origin
Why this matters

Default browser behavior leaks full URLs (including query params and tokens) to every third-party resource — set a strict policy.

Learn more ▾

Without a Referrer-Policy header, browsers send the full referring URL with images, scripts, and fonts loaded from third-party origins. URLs containing tokens, user IDs, or session params end up in third-party logs. Set `Referrer-Policy: strict-origin-when-cross-origin` (or stricter) to limit leakage.

Source: MDN / W3C

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

D
Subresource Integrity
Action
2 of 17 external resources have SRI
FIX
2 of 17 external resources have SRI
Warning::
External script from cdn.vector.co lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.vector.co/pixel.js
Info::
script from www.gstatic.com has SRI protection
Info::
script from www.gstatic.com has SRI protection
Warning::
External script from bat.bing.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://bat.bing.com/bat.js
Warning::
External script from cdn.cookielaw.org lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?did=7a2a6d0d-5278-453f-8d34-038d9250c914
Warning::
External script from static.ads-twitter.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://static.ads-twitter.com/uwt.js
Warning::
External script from www.googletagmanager.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://www.googletagmanager.com/gtag/js?id=G-CP29SJK4E7&cx=c&gtm=4e6460
Warning::
External script from www.googletagmanager.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://www.googletagmanager.com/gtag/js?id=AW-662873615&cx=c&gtm=4e6460
Warning::
External script from www.redditstatic.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://www.redditstatic.com/ads/pixel.js
Warning::
External script from snap.licdn.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://snap.licdn.com/li.lms-analytics/insight.min.js
Warning::
External script from cdn.cookielaw.org lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.cookielaw.org/scripttemplates/otSDKStub.js
Warning::
External script from cdn.addevent.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.addevent.com/libs/atc/1.6.1/atc.min.js
Warning::
External script from cdn.cookielaw.org lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.cookielaw.org/scripttemplates/202304.1.0/otBannerSdk.js
Warning::
External script from www.google.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://www.google.com/recaptcha/api.js?render=6LfqLR0sAAAAAHKwteQhNuV9JN2nMULiKKVd4Qfe
Warning::
External script from cdn.cr-relay.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.cr-relay.com/v1/site/5c7cdf16-fbc0-4bb8-b39e-a8c6136687b9/signals.js
Warning::
External script from cdn.cookielaw.org lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://cdn.cookielaw.org/scripttemplates/202304.1.0/otBannerSdk.js
Warning::
External script from www.googletagmanager.com lacks integrity attribute
Without SRI, if this CDN is compromised, attackers could inject malicious code.
Got: https://www.googletagmanager.com/gtm.js?id=GTM-N633BZ8
SRI Coverage 2 / 17 of external resources have integrity hashes
TagDomainIntegrity
<script>cdn.vector.co✗ Missing
<script>www.gstatic.com✓ Protected
<script>www.gstatic.com✓ Protected
<script>bat.bing.com✗ Missing
<script>cdn.cookielaw.org✗ Missing
<script>static.ads-twitter.com✗ Missing
<script>www.googletagmanager.com✗ Missing
<script>www.googletagmanager.com✗ Missing
<script>www.redditstatic.com✗ Missing
<script>snap.licdn.com✗ Missing
<script>cdn.cookielaw.org✗ Missing
<script>cdn.addevent.com✗ Missing
<script>cdn.cookielaw.org✗ Missing
<script>www.google.com✗ Missing
<script>cdn.cr-relay.com✗ Missing
<script>cdn.cookielaw.org✗ Missing
<script>www.googletagmanager.com✗ Missing
F
Email Security
Action
No DMARC
FIX
No DMARC
Warning::
No DMARC record found
Without DMARC, email receivers have no policy for handling authentication failures.
DMARC

No DMARC record found

Without DMARC, email receivers have no policy for handling authentication failures from your domain.

Without DMARC, email receivers have no policy for handling authentication failures.

Why this matters

Without DMARC, anyone can send phishing emails using your domain name.

Learn more ▾

DMARC tells receiving mail servers what to do with email that fails SPF/DKIM checks for your domain. With a strict 'p=reject' policy, spoofed emails get bounced; without it they reach the inbox. Domains used in phishing campaigns lose deliverability and brand trust fast.

Source: DMARC.org / NIST

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=()
D
security.txt
Action
No /.well-known/security.txt published
FIX

security.txt

No security.txt found at /.well-known/security.txt

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
A
Content Security Policy
7 of 10 CSP checks passed
PASS
7 of 10 CSP checks passed
Info::
Raw CSP policy
Got: default-src 'self'; base-uri 'none'; connect-src 'self' https://*.amplitude.com https://*.google-analytics.com https://analytics.google.com https://*.analytics.google.com https://*.googletagmanager.com https://stats.g.doubleclick.net https://cdn.cookielaw.org/ https://geolocation.onetrust.com/ https://js.zi-scripts.com https://ws.zoominfo.com https://api.cr-relay.com/ https://*.vector.co https://rp.liadm.com https://idx.liadm.com https://api.unifyintent.com https://www.google.com/recaptcha/enterprise/* https://www.google.com/recaptcha/enterprise/clr https://www.google.com/recaptcha/api2 https://www.google.com/recaptcha/api2/* https://www.googleadservices.com https://www.google.com/pagead/ https://googleads.g.doubleclick.net https://www.google.com/ccm/ https://www.google.com/measurement/ https://pro.ip-api.com https://pixel-config.reddit.com https://www.redditstatic.com/ads/ https://conversions-config.reddit.com https://px.ads.linkedin.com/ https://aplo-evnt.com https://a.usbrowserspeed.com https://join.slack.com https://forminit.com https://app.prefect.cloud; font-src 'self' data: https://fonts.gstatic.com; frame-ancestors 'none'; frame-src https://www.googletagmanager.com https://www.google.com/recaptcha/ https://recaptcha.google.com/recaptcha/ https://www.youtube.com/ https://td.doubleclick.net/ https://prefect.chilipiper.com/ https://i.liadm.com; img-src 'self' data: https://cdn.cookielaw.org https://*.google-analytics.com https://*.googletagmanager.com https://www.google.com/pagead/ https://www.google.com/ccm/ https://www.googleadservices.com https://googleads.g.doubleclick.net https://px.ads.linkedin.com/ https://px4.ads.linkedin.com/ https://www.linkedin.com/px/ https://alb.reddit.com https://play.instruqt.com https://t.co/ https://analytics.twitter.com/; manifest-src 'self'; media-src 'self'; object-src 'none'; script-src 'none'; script-src-elem 'self' blob: 'unsafe-inline' https://*.googletagmanager.com https://www.google.com/recaptcha/ https://www.gstatic.com/recaptcha/ https://www.googleadservices.com https://googleads.g.doubleclick.net https://cdn.addevent.com https://cdn.cookielaw.org/ https://js.zi-scripts.com https://ws-assets.zoominfo.com https://cdn.cr-relay.com/ https://commonroom.io/ https://*.vector.co https://d-code.liadm.com https://www.redditstatic.com/ads/ https://snap.licdn.com/ https://static.ads-twitter.com/ https://assets.apollo.io/ https://www.youtube.com/ https://prefect.chilipiper.com/ https://js.chilipiper.com/ https://a.usbrowserspeed.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; child-src 'none'; worker-src 'none'
Info::
default-src directive is set
Got: default-src 'self'
Info::
No 'unsafe-inline' in script source
Info::
No 'unsafe-eval' in script source
Info::
No wildcard in script source
Info::
object-src is set to 'none'
Got: object-src 'none'
Info::
base-uri is properly restricted
Got: base-uri 'none'
Info::
frame-ancestors directive is set
Got: frame-ancestors 'none'
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

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

default-src 'self'
base-uri 'none'
connect-src 'self'https://*.amplitude.comhttps://*.google-analytics.comhttps://analytics.google.comhttps://*.analytics.google.comhttps://*.googletagmanager.comhttps://stats.g.doubleclick.nethttps://cdn.cookielaw.org/https://geolocation.onetrust.com/https://js.zi-scripts.comhttps://ws.zoominfo.comhttps://api.cr-relay.com/https://*.vector.cohttps://rp.liadm.comhttps://idx.liadm.comhttps://api.unifyintent.comhttps://www.google.com/recaptcha/enterprise/*https://www.google.com/recaptcha/enterprise/clrhttps://www.google.com/recaptcha/api2https://www.google.com/recaptcha/api2/*https://www.googleadservices.comhttps://www.google.com/pagead/https://googleads.g.doubleclick.nethttps://www.google.com/ccm/https://www.google.com/measurement/https://pro.ip-api.comhttps://pixel-config.reddit.comhttps://www.redditstatic.com/ads/https://conversions-config.reddit.comhttps://px.ads.linkedin.com/https://aplo-evnt.comhttps://a.usbrowserspeed.comhttps://join.slack.comhttps://forminit.comhttps://app.prefect.cloud
font-src 'self'data:https://fonts.gstatic.com
frame-ancestors 'none'
frame-src https://www.googletagmanager.comhttps://www.google.com/recaptcha/https://recaptcha.google.com/recaptcha/https://www.youtube.com/https://td.doubleclick.net/https://prefect.chilipiper.com/https://i.liadm.com
img-src 'self'data:https://cdn.cookielaw.orghttps://*.google-analytics.comhttps://*.googletagmanager.comhttps://www.google.com/pagead/https://www.google.com/ccm/https://www.googleadservices.comhttps://googleads.g.doubleclick.nethttps://px.ads.linkedin.com/https://px4.ads.linkedin.com/https://www.linkedin.com/px/https://alb.reddit.comhttps://play.instruqt.comhttps://t.co/https://analytics.twitter.com/
manifest-src 'self'
media-src 'self'
object-src 'none'
script-src 'none'
script-src-elem 'self'blob:'unsafe-inline'https://*.googletagmanager.comhttps://www.google.com/recaptcha/https://www.gstatic.com/recaptcha/https://www.googleadservices.comhttps://googleads.g.doubleclick.nethttps://cdn.addevent.comhttps://cdn.cookielaw.org/https://js.zi-scripts.comhttps://ws-assets.zoominfo.comhttps://cdn.cr-relay.com/https://commonroom.io/https://*.vector.cohttps://d-code.liadm.comhttps://www.redditstatic.com/ads/https://snap.licdn.com/https://static.ads-twitter.com/https://assets.apollo.io/https://www.youtube.com/https://prefect.chilipiper.com/https://js.chilipiper.com/https://a.usbrowserspeed.com
style-src 'self''unsafe-inline'https://fonts.googleapis.com
child-src 'none'
worker-src 'none'
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_CHACHA20_POLY1305_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 27 days)
Got: 2026-05-05T11:37:21Z
Warning::
Certificate expires soon (27 days remaining)
Renew the certificate before it expires to avoid browser warnings.
Got: 2026-05-05T11:37:21Z
Info::
Certificate chain has 2 certificates
Info::
Certificate uses modern signature algorithm
Got: SHA256-RSA
Info::
Certificate covers 1 domain(s)
Got: www.prefect.io
Info::
Certificate is issued by a trusted CA
Got: CN=R12,O=Let's Encrypt,C=US

Renew the certificate before it expires to avoid browser warnings.

Why this matters

Cert expiry within the renewal window — fix now while there's no user impact, instead of after expiry when there's a full outage.

Learn more ▾

Most CAs recommend renewal at 30 days remaining. Inside that window, schedule the renewal immediately and verify auto-renewal is configured if applicable. Don't wait until 7 days; weekend / holiday timing can leave you exposed.

Source: Let's Encrypt / CA renewal best practice

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_CHACHA20_POLY1305_SHA256
HTTP Version
HTTP/1.1

Certificate Chain

Leaf Certificate
Subject CN=www.prefect.ioIssuer CN=R12,O=Let's Encrypt,C=USValid 2026-02-04T11:37:22Z → 2026-05-05T11:37:21ZExpires in 27 days — expiring soon! SANs www.prefect.ioSignature SHA256-RSASerial 5988b6fc80311fa101d0016027ecc579623
Intermediate (CA Certificate)
Subject CN=R12,O=Let's Encrypt,C=USIssuer CN=ISRG Root X1,O=Internet Security Research Group,C=USValid 2024-03-13T00:00:00Z → 2027-03-12T23:59:59ZExpires in 339 days Signature SHA256-RSASerial c212324b70a9b49171dc40f7e285263c
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::
No security.txt found
Consider adding a security.txt at /.well-known/security.txt.
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✓ Not foundSecurity Policy—
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 (includeSubDomains, preload)
Info::
HSTS preload enabled
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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