CVE-2026-76214
phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge
- State
- Published
- Severity
- 9.1 Critical
- Published
- Aug 19, 2026
- Updated
- Aug 21, 2026
- Reserved
- Aug 19, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.1 Critical | 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 | VulnCheck |
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-294 Authentication Bypass by Capture-replay
Affected Products
| Product | Versions |
|---|---|
phpMyFAQthorsten |
|
References
- GitHub Security Advisory (GHSA-f534-wv9g-wx2w)vendor-advisory
- VulnCheck Advisory: phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challengethird-party-advisory
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