CVE-2026-76214: Authentication Bypass by Capture-replay in thorsten phpMyFAQ
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.
AI Analysis
Technical Summary
phpMyFAQ before version 4.1.7 (specifically versions <= 4.1.5) fails to persist the WebAuthn login challenge generated by the prepareForLogin function. Neither WebAuthn controller saves the mutated key objects back to the database, causing the anti-replay comparison to be skipped by a null guard at login. This allows an attacker who captures a successful WebAuthn assertion to replay it indefinitely and authenticate as the user without any interaction or possession of the hardware key.
Potential Impact
An attacker who captures a valid WebAuthn assertion can bypass authentication controls by replaying the assertion indefinitely, gaining unauthorized access to user accounts without needing the user's hardware key or interaction. This represents a critical authentication bypass vulnerability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is currently available. Until a fix is released, users should consider disabling WebAuthn login or implementing additional monitoring for suspicious login activity involving WebAuthn assertions.
CVE-2026-76214: Authentication Bypass by Capture-replay in thorsten phpMyFAQ
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.
CVSS v4.0
Score 9.1critical
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
phpMyFAQ before version 4.1.7 (specifically versions <= 4.1.5) fails to persist the WebAuthn login challenge generated by the prepareForLogin function. Neither WebAuthn controller saves the mutated key objects back to the database, causing the anti-replay comparison to be skipped by a null guard at login. This allows an attacker who captures a successful WebAuthn assertion to replay it indefinitely and authenticate as the user without any interaction or possession of the hardware key.
Potential Impact
An attacker who captures a valid WebAuthn assertion can bypass authentication controls by replaying the assertion indefinitely, gaining unauthorized access to user accounts without needing the user's hardware key or interaction. This represents a critical authentication bypass vulnerability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is currently available. Until a fix is released, users should consider disabling WebAuthn login or implementing additional monitoring for suspicious login activity involving WebAuthn assertions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-19T11:34:28.577Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a85bc76acd9273b492f498c
Added to database: 08/19/2026, 14:23:50 UTC
Last enriched: 08/19/2026, 14:54:59 UTC
Last updated: 08/19/2026, 18:38:39 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.