Vulnerability in Phpmyfaq
CVE-2026-76214
phpMyFAQ before 4.1.7 fails to persist the WebAuthn login challenge generated by prepareForLogin, because neither WebAuthn controller saves the mutated key objects back to the database. At login the anti-replay comparison is skipped by its own null guard, allowing an attacker who captures a successful WebAuthn assertion to replay it indefinitely and authenticate as the user without any interaction or hardware key.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/phpmyfaq-before-webauthn-replay-attack-via-challen… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-76214?
- CVE-2026-76214 is a high-severity vulnerability in Phpmyfaq, classified under Authentication Bypass by Capture-replay. CVSS score: 7.4/10. Published 2026-08-19.
- How severe is CVE-2026-76214?
- High severity. CVSS v3 base score is 7.4 out of 10.