# CVE-2026-76214

## Summary

- **CVE ID:** CVE-2026-76214
- **Severity:** CRITICAL
- **CVSS Score:** 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)
- **CWE:** CWE-294
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 21, 2026

## Description

phpMyFAQ before 4.1.7 (affected versions <= 4.1.5) 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.

## Affected Products

- thorsten — phpMyFAQ (0)
- thorsten — phpMyFAQ (4.1.7)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._