Authentication Bypass in phpMyFAQ Affects Users via Microsoft Entra ID
CVE-2026-111895

7.6HIGH

Key Information:

Vendor

Thorsten

Status
pHPMyFAQ
Vendor
CVE Published:
17 October 2026

What is CVE-2026-111895?

An authentication bypass vulnerability exists in phpMyFAQ versions 3.2.0 prior to 4.0.0 and 4.0.2 prior to 4.2.0-beta. This flaw affects the Microsoft Entra ID login flow, which erroneously utilizes the mutable preferred_username claim for user linking. The AuthEntraId::create() method fails to handle the duplicate-login exception effectively, allowing attackers with control over an Entra identity in the designated tenant, possessing a matching preferred_username, to usurp local accounts, including those with super-admin privileges.

Affected Version(s)

phpMyFAQ 3.2.0 < 4.0.0

phpMyFAQ 4.0.2 < 4.2.0-beta

phpMyFAQ 4.0.0

References

https://github.com/thorsten/phpMyFAQ/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/phpmyfaq-3.2.0-befor...
third-party-advisory

CVSS V4

Score:
7.6
Severity:
HIGH
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

nirtem
.