Open
Cached
·
just now
95/100
SECURITY SCORE
Certificate Information
Subject
CN=gitbook.com
Issuer
C=US, O=Google Trust Services, CN=WE1
Valid From
December 26, 2025
Valid Until
March 26, 2026
69 days
Public Key
ECDSA
256 bit
(P-256)
Adequate
Signature Algorithm
ECDSA-SHA256
SHA-256 Fingerprint
FC:CD:41:85:FC:83:56:46:2E:47:C4:01:31:38:FB:8C:C0:DD:44:82:98:FD:25:6C:20:6B:BB:A0:85:A1:B3:73
Alternative Names
Security Configuration
TLS Protocols
TLS 1.2
TLS 1.3
Forward Secrecy
Supported
(Modern clients use PFS)
HTTP Security Headers
Status
Strict-Transport-Security
Excellent
max-age=63072000; includeSubDomains; preload
Content-Security-Policy
Good
base-uri; child-src; connect-src; +15 more
base-uri 'none';child-src 'none';connect-src 'self' vitals.vercel-insights.com status-page-o50jbi5bj-incident-io-team.vercel.app https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://*.google.com https://*.google.co.uk https://*.g.doubleclick.net https://global.localizecdn.com https://app.localizejs.com https://*.unbabel.com https://*.bablic.com;default-src 'self';font-src 'self';form-action 'self';frame-ancestors self;frame-src 'none';img-src 'self' data: https://*.google-analytics.com https://*.googletagmanager.com https://*.analytics.google.com https://*.g.doubleclick.net https://*.google.com https://*.google.co.uk https://global.localizecdn.com https://assets.localizecdn.com https://uploads.bablic.com;manifest-src 'self';media-src 'self';object-src 'none';prefetch-src 'self';script-src 'self' 'unsafe-inline' https:;style-src 'self' 'unsafe-inline';worker-src 'self';report-uri https://o494704.ingest.sentry.io/api/4504554480795648/security?security_key=5d578c0eb4bd4811adf4f2176db9a1c8;report-to https://o494704.ingest.sentry.io/api/4504554480795648/security?security_key=5d578c0eb4bd4811adf4f2176db9a1c8;
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
no-referrer
Permissions-Policy
Present
clipboard-read=(),clipboard-write=(self),gamepad=(),speaker-selection=(),accelerometer=(),ambient-light-sensor=(),autoplay=(),battery=(),camera=(),cross-origin-isolated=(),display-capture=(),document-domain=(),encrypted-media=(),execution-while-not-rendered=(),execution-while-out-of-viewport=(),fullscreen=(),geolocation=(),gyroscope=(),magnetometer=(),microphone=(),midi=(),navigation-override=(),payment=(),picture-in-picture=(),publickey-credentials-get=(),screen-wake-lock=(),sync-xhr=(),usb=(),web-share=(),xr-spatial-tracking=()
Recommendations
- • Strengthen CSP by removing 'unsafe-eval'
CAA Records (Certificate Authority Authorization)
CAA Records
Not Configured
(Any CA can issue certificates)
CAA Issues
- • No CAA records configured - any CA can issue certificates
Recommendations
- • Implement CAA records to restrict which CAs can issue certificates for your domain
- • This adds an extra layer of security against unauthorized certificate issuance
- • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
- • Consider adding 'iodef' record to receive security incident reports