What is CVE-2026-111898?

CVE-2026-111898 is a high-severity vulnerability in Thorsten Phpmyfaq, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-10-17.

How severe is CVE-2026-111898?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Thorsten Phpmyfaq

CVE-2026-111898

phpMyFAQ 4.2.0-alpha before 4.2.0-beta contains an authentication bypass vulnerability that allows Keycloak users to take over local accounts by matching preferred_username or email. Attackers controlling a Keycloak identity with a colliding username or unverified email can log in through /auth/keycloak/authorize to bind their subject and gain superadmin privileges.

Vulnerability class: Broken Authentication

Published 2026-10-17 · last modified 2026-10-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Thorsten Phpmyfaq

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/thorsten/phpMyFAQ/security/advisories/GHSA-rg4w-2j3r-2hhp (vendor-advisory)
www.vulncheck.com/advisories/phpmyfaq-4.2.0-alpha-before-4.2.0-beta-account-tak… (third-party-advisory)

Frequently asked questions

What is CVE-2026-111898?: CVE-2026-111898 is a high-severity vulnerability in Thorsten Phpmyfaq, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-10-17.
How severe is CVE-2026-111898?: High severity. CVSS v3 base score is 7.5 out of 10.