CVE-2026-76214

EUVD-2026-62455
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.4 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 30.93%
Affected Products (NVD)
VendorProductVersion
phpmyfaqphpmyfaq
𝑥
< 4.1.7
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w
https://www.vulncheck.com/advisories/phpmyfaq-before-webauthn-replay-attack-via-challenge