WebAuthn Login Vulnerability in phpMyFAQ by phpMyFAQ
CVE-2026-76214

9.1CRITICAL

Key Information:

Vendor

Thorsten

Status
pHPMyFAQ
Vendor
CVE Published:
19 August 2026

What is CVE-2026-76214?

phpMyFAQ versions prior to 4.1.7 are vulnerable to a WebAuthn replay attack. The vulnerability arises because the system does not properly persist the WebAuthn login challenge generated during the login preparation phase. As a result, if an attacker captures a legitimate WebAuthn assertion, they can replay it without any additional user interaction or hardware key verification. This flaw poses significant security risks, enabling unauthorized access to user accounts.

Affected Version(s)

phpMyFAQ 0 < 4.1.7

phpMyFAQ 4.1.7

References

https://github.com/thorsten/phpMyFAQ/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/phpmyfaq-before-weba...
third-party-advisory

CVSS V4

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

arpitjain099
.