Catalog/INFRASTRUCTURE/cert-transparency
SCAN-ID: CERT-TRANSPARENCYREVISION 2026.4
INFRASTRUCTURECVSS 5.5 (MEDIUM)

Certificate Transparency & Rogue CA Scanner

Monitor public Certificate Transparency (CT) logs to identify unauthorized or unexpected certificates issued for your domain.

Technical Scope & Verification Behavior

Queries public CT logs (crt.sh, Google) for wildcards, unapproved Certificate Authorities (CAs), and suspicious recent issuances.

Automated Inspection Checks (6)
Passive URL parameter fuzzing
Non-destructive boundary tests
Header & cookie flag assertions
Differential latency timing

Proof of Concept (PoC) Vector

Canonical test payload dispatched during security surface audits.

Certificate issued by unrecognized CA without CAA authorization

Probe Execution Simulator

Watch the probe engine test this signature in an isolated sandbox.

probe-runner (isolated ephemeral container)
Click 'Simulate Check' to watch the headless audit engine test this vector.

Remediation Patch

DNS CAA Record Enforcement

patch.diff (dns)
--- a/handler.dns (Vulnerable)
; No CAA record present
+++ b/handler.dns (Remediated)
example.com. IN CAA 0 issue "letsencrypt.org"
example.com. IN CAA 0 iodef "mailto:security@example.com"

Publish CAA records specifying exactly which Certificate Authorities are authorized to issue certificates for your domain.

AI Agent Prompt (Cursor · Claude · Copilot)

Copy and paste into your editor to refactor this issue automatically.

"Add a CAA DNS record for your apex domain restricting issuance to your approved CA (e.g. letsencrypt.org)."

Run Isolated Check

Test your public domain specifically for Certificate Transparency & Rogue CA Scanner.

100% passive • No server load

Specification Details

CVSS Score
5.5 / 10.0
Severity Level
MEDIUM
Category
INFRASTRUCTURE
Test Vectors
6 automated
Execution SLA
< 2.5 seconds
False Positive Defense
Strict assertion
Related Standards
#Certificates#CAA#Transparency#PKI

Run continuous monitoring for Certificate Transparency & Rogue CA Scanner

Audit your site across all 41 vectors automatically on every deploy.

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