CVE-2026-76214CWE-294

CVE-2026-76214

High · published August 19, 2026

CVSS v3.1

7.4

EPSS

Percentile

32.1

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.4 · HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0: 9.1 · CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS: 0.00392 · 32.1th percentile
Weakness: CWE-294 · Authentication Bypass by Capture-replay
Published: 2026-08-19T18:17Z

Affected products (1)

Product	Versions	Fixed in
phpmyfaq/phpmyfaq	< 4.1.7	4.1.7

References (2)

https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w · [email protected]https://www.vulncheck.com/advisories/phpmyfaq-before-webauthn-replay-attack-via-challenge · [email protected]

EPSS history

Timeline

19 AUG 14:01Z
phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge
cvelistv5