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SECURITY SCORE
Certificate Information
Subject
CN=cloud.opreturn.de
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
November 23, 2025
Valid Until
February 21, 2026
50 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
C2:28:62:F0:58:9A:2B:43:B0:AF:10:10:07:8C:CC:B6:A4:47:8E:79:B8:25:DC:69:05:77:48:E8:64:E5:06:67
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
Present
max-age=15552000; includeSubDomains
Content-Security-Policy
Basic
default-src; base-uri; manifest-src; +12 more
default-src 'none';base-uri 'none';manifest-src 'self';script-src 'nonce-kcgpiamoBFPJ2+tuBrWhqHkDM2fHfDrWhEppLVcuIpk=' blob: 'wasm-unsafe-eval';script-src-elem 'strict-dynamic' 'nonce-kcgpiamoBFPJ2+tuBrWhqHkDM2fHfDrWhEppLVcuIpk=' blob: 'wasm-unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: https://*.tile.openstreetmap.org https://cloud.opreturn.de;font-src 'self' data:;connect-src 'self' blob: stun.nextcloud.com:443 *;media-src 'self' blob:;frame-src 'self' nc: https://cloud.opreturn.de data:;child-src blob: 'self';frame-ancestors 'self' https://cloud.opreturn.de;worker-src blob: 'self' *;form-action 'self' https://cloud.opreturn.de
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
no-referrer
Permissions-Policy
Missing
Not configured
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Improve CSP by adding more specific directives and removing 'unsafe-inline'
- • Consider adding Permissions-Policy to control browser features
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