CVE-2026-76214

phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge

Published: Aug 19, 2026Updated: Sep 1, 2026 Sources: CVE List NVDCWE-294

7.4HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-294

Affected Products

thorsten

individual-devaka phpmyfaq, thorsten/phpmyfaq

phpMyFAQOn-premWeb App

oss-project

Exploitability

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Defense Evasion

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References

https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w

github.com

https://www.vulncheck.com/advisories/phpmyfaq-before-webauthn-replay-attack-via-challenge

vulncheck.com

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