What is CVE-2026-111903?

CVE-2026-111903 is a medium-severity vulnerability in Thorsten Phpmyfaq, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-17.

How severe is CVE-2026-111903?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Thorsten Phpmyfaq

CVE-2026-111903

phpMyFAQ 4.2.0-alpha before 4.2.0-beta contains a stored cross-site scripting vulnerability in SvgSanitizer that allows users with FAQ_EDIT permission to bypass sanitization using XML DTD custom entities. Attackers can upload an SVG defining an entity that expands to javascript in an anchor href, executing script when viewers click it to hijack admin sessions.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

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-79 — Cross-site Scripting

References

github.com/thorsten/phpMyFAQ/security/advisories/GHSA-j3v5-p957-w6gq (vendor-advisory)
www.vulncheck.com/advisories/phpmyfaq-4.2.0-alpha-before-4.2.0-beta-stored-xss-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-111903?: CVE-2026-111903 is a medium-severity vulnerability in Thorsten Phpmyfaq, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-17.
How severe is CVE-2026-111903?: Medium severity. CVSS v3 base score is 5.4 out of 10.