Security - https://curl.se BeaverCheck Audit

F

Email Security

Action

No DMARC

FIX

No DMARC

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

B

CORS Configuration

No CORS headers

REVIEW

No CORS headers

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: https://hackerone.com/curl

Expires: 2027-01-21T00:00:00Z

Policy: https://curl.se/.well-known/security.txt

A

Security Headers

8 of 10 headers properly configured

PASS

8 of 10 headers properly configured

HSTS is missing includeSubDomains

Without includeSubDomains, subdomains can still be accessed over HTTP.

Got: max-age=31536000 Expected: max-age=31536000; includeSubDomains

X-Content-Type-Options is properly configured

Got: nosniff

X-Frame-Options is properly configured

Got: deny

Referrer-Policy is properly configured

Got: strict-origin

Permissions-Policy is set

Got: accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), bluetooth=(), browsing-topics=(), camera=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=(), gamepad=(), geolocation=(), gyroscope=(), hid=(), idle-detection=(), local-fonts=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), serial=(), speaker-selection=(), usb=(), web-share=(), xr-spatial-tracking=()

Content-Security-Policy is present

Got: upgrade-insecure-requests; block-all-mixed-content; default-src 'none'; img-src …

Cross-Origin-Opener-Policy is properly configured

Got: same-origin

Cross-Origin-Embedder-Policy is set

Got: require-corp

X-Powered-By header is not present

Server header reveals version information

The Server header discloses the software version, aiding attackers in targeting known vulnerabilities. Remove the version number.

Got: nginx/1.27.5

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

The Server header discloses the software version, aiding attackers in targeting known vulnerabilities. Remove the version number.

Why this matters

Server: nginx/1.18.0 tells attackers exactly which CVEs to test — strip the version string.

Learn more ▾

Server version disclosure helps attackers select exploits matching your stack. Configure your server to omit the version (nginx: `server_tokens off;`, Apache: `ServerTokens Prod`). Doesn't fix vulnerabilities but removes the easy reconnaissance step.

Source: OWASP

A+

Content Security Policy

8 of 10 CSP checks passed

PASS

8 of 10 CSP checks passed

Raw CSP policy

Got: upgrade-insecure-requests; block-all-mixed-content; default-src 'none'; img-src 'self'; style-src 'unsafe-inline' 'self'; form-action 'self'; frame-ancestors 'none'; require-trusted-types-for 'script';

default-src directive is set

Got: default-src 'none'

No 'unsafe-inline' in script source

No 'unsafe-eval' in script source

No wildcard in script source

object-src falls back to default-src

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'

frame-ancestors directive is set

Got: frame-ancestors 'none'

form-action directive is set

Got: form-action 'self'

upgrade-insecure-requests is enabled

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

Parsed Policy

upgrade-insecure-requests

block-all-mixed-content

default-src 'none'

img-src 'self'

style-src 'unsafe-inline''self'

form-action 'self'

frame-ancestors 'none'

require-trusted-types-for 'script'

A+

TLS & Certificates

TLS 1.3, 7 checks passed

PASS

TLS 1.3, 7 checks passed

TLS 1.3 is used

Got: TLS 1.3

Strong cipher suite is used

Got: TLS_AES_128_GCM_SHA256

HTTP/2 is not negotiated

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

Got: http/1.1

Certificate is valid (expires in 74 days)

Got: 2026-07-05T16:32:54Z

Certificate chain has 2 certificates

Certificate uses modern signature algorithm

Got: SHA256-RSA

Certificate covers 1 domain(s)

Got: curl.se

Certificate is issued by a trusted CA

Got: CN=R12,O=Let's Encrypt,C=US

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 CN=curl.seIssuer CN=R12,O=Let's Encrypt,C=USValid 2026-04-06T16:32:55Z → 2026-07-05T16:32:54ZExpires in 74 days SANs curl.seSignature SHA256-RSASerial 54163dccaf342a6d1c632da387cd85340f2

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 325 days Signature SHA256-RSASerial c212324b70a9b49171dc40f7e285263c

A+

Cookie Security

No cookies set — no cookie security risks

PASS

No cookies set — no cookie security risks

No cookies detected — no cookie security risks to report.

A+

Subresource Integrity

No external resources

PASS

No external resources

No external resources to protect

SRI Coverage No external resources — SRI not applicable

A+

JS Library Vulnerabilities

No known vulnerabilities

PASS

No known vulnerabilities

No known JavaScript library vulnerabilities detected

No known JavaScript library vulnerabilities detected.

A+

Information Leakage

No exposures

PASS

No exposures

security.txt is present — good practice

No sensitive files exposed

No sensitive files exposed — all paths returned 404.

Path	Status	Category	Risk
/.git/HEAD	✓ Not found	Version Control	—
/.git/config	✓ Not found	Version Control	—
/.svn/entries	✓ Not found	Version Control	—
/.env	✓ Not found	Configuration	—
/.env.local	✓ Not found	Configuration	—
/.env.production	✓ Not found	Configuration	—
/wp-config.php	✓ Not found	Configuration	—
/.htaccess	✓ Not found	Configuration	—
/phpinfo.php	✓ Not found	Debug	—
/server-status	✓ Not found	Debug	—
/server-info	✓ Not found	Debug	—
/.well-known/security.txt	✗ Exposed	Security Policy	Info

A+

Permissions-Policy

31 directives, 0 missing

PASS

31 directives, 0 missing

accelerometer=() — blocked for all origins

ambient-light-sensor=() — blocked for all origins

autoplay=() — blocked for all origins

battery=() — blocked for all origins

bluetooth=() — blocked for all origins

browsing-topics=() — blocked for all origins

camera=() — blocked for all origins

display-capture=() — blocked for all origins

document-domain=() — blocked for all origins

encrypted-media=() — blocked for all origins

execution-while-not-rendered=() — blocked for all origins

execution-while-out-of-viewport=() — blocked for all origins

fullscreen=() — blocked for all origins

gamepad=() — blocked for all origins

geolocation=() — blocked for all origins

gyroscope=() — blocked for all origins

hid=() — blocked for all origins

idle-detection=() — blocked for all origins

local-fonts=() — blocked for all origins

magnetometer=() — blocked for all origins

microphone=() — blocked for all origins

midi=() — blocked for all origins

payment=() — blocked for all origins

picture-in-picture=() — blocked for all origins

publickey-credentials-get=() — blocked for all origins

screen-wake-lock=() — blocked for all origins

serial=() — blocked for all origins

speaker-selection=() — blocked for all origins

usb=() — blocked for all origins

web-share=() — blocked for all origins

xr-spatial-tracking=() — blocked for all origins

Raw Header

accelerometer=() ambient-light-sensor=() autoplay=() battery=() bluetooth=() browsing-topics=() camera=() display-capture=() document-domain=() encrypted-media=() execution-while-not-rendered=() execution-while-out-of-viewport=() fullscreen=() gamepad=() geolocation=() gyroscope=() hid=() idle-detection=() local-fonts=() magnetometer=() microphone=() midi=() payment=() picture-in-picture=() publickey-credentials-get=() screen-wake-lock=() serial=() speaker-selection=() usb=() web-share=() xr-spatial-tracking=()

Feature Permissions

Blocked Self Only Unrestricted Not Set

accelerometer Blocked

ambient-light-sensor Blocked

autoplay Blocked

battery Blocked

bluetooth Blocked

browsing-topics Blocked

camera Blocked

display-capture Blocked

document-domain Blocked

encrypted-media Blocked

execution-while-not-rendered Blocked

execution-while-out-of-viewport Blocked

fullscreen Blocked

gamepad Blocked

geolocation Blocked

gyroscope Blocked

hid Blocked

idle-detection Blocked

local-fonts Blocked

magnetometer Blocked

microphone Blocked

midi Blocked

payment Blocked

picture-in-picture Blocked

publickey-credentials-get Blocked

screen-wake-lock Blocked

serial Blocked

speaker-selection Blocked

usb Blocked

web-share Blocked

xr-spatial-tracking Blocked

A+

Transport Security

HTTP/3, HSTS, and TLS version analysis

PASS

HTTP/3, HSTS, and TLS version analysis

HTTP/3 (QUIC) supported

The server advertises HTTP/3 via Alt-Svc for faster connections on mobile networks.

HSTS enabled (base policy)

HSTS missing includeSubDomains

Without includeSubDomains, HSTS only protects the exact domain.

TLS 1.3 in use (fastest handshake, 1-RTT)