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CVE-2026-76214 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w	[email protected]	MitigationVendor Advisory
https://www.vulncheck.com/advisories/phpmyfaq-before-webauthn-replay-attack-via-challenge	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-294	Authentication Bypass by Capture-replay	[email protected]

Affected Products

Product	Versions
phpmyfaq phpmyfaq	< 4.1.7
CPE cpe:2.3:a:phpmyfaq:phpmyfaq:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 1, 2026	Initial Analysis	[email protected]
Aug 21, 2026	CVE Modified	[email protected]
Aug 20, 2026	CVE Modified	CISA-ADP
Aug 19, 2026	New CVE Received	[email protected]