CVE-2026-76214 json
phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge
published 3mo ago modified 2mo ago also EUVD-2026-62455 , GHSA-f534-wv9g-wx2w
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository thorsten/phpMyFAQ. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- thorsten phpMyFAQ 4.1.7
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- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- thorsten phpMyFAQ
Classification
- Weakness
-
- CWE-294 Authentication Bypass by Capture-replay
References
-
github.com
/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w
vendor-advisory, mitigation, advisory
-
vulncheck.com
/advisories/phpmyfaq-before-webauthn-replay-attack-via-challenge
third-party-advisory
Sources
- CVE List CVE-2026-76214
- NVD CVE-2026-76214
- Maintainer advisory GHSA-f534-wv9g-wx2w
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of thorsten/phpMyFAQ published their own advisory on GitHub. Reviewed sources take precedence over it.