Open
Cached
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just now
92/100
SECURITY SCORE
Certificate Information
Subject
CN=mattermost.iem.at
Issuer
C=US, O=Let's Encrypt, CN=E8
Valid From
October 25, 2025
Valid Until
January 23, 2026
62 days
Public Key
ECDSA
384 bit
(P-384)
Strong
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
74:72:4F:35:9E:35:2A:27:A6:00:F6:C5:62:1C:12:BC:05:D1:49:33:1B:3B:5D:EC:EE:DD:D9:82:A5:C1:AE:F3
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=63072000
Content-Security-Policy
Basic
frame-ancestors; script-src
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Present
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Improve CSP by adding more specific directives and removing 'unsafe-inline'
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