CVE-2026-34974

phpMyFAQ: SVG Sanitizer Bypass via HTML Entity Encoding leads to Stored XSS and Privilege Escalation

phpMyFAQ is an open source FAQ web application. Prior to version 4.1.1, the regex-based SVG sanitizer in phpMyFAQ (SvgSanitizer.php) can be bypassed using HTML entity encoding in javascript: URLs within SVG <a href> attributes. Any user with edit_faq permission can upload a malicious SVG that executes arbitrary JavaScript when viewed, enabling privilege escalation from editor to full admin takeover. This issue has been patched in version 4.1.1.

Affected

thorsten · phpMyFAQ

CVSS v3.1 GITHUB

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS

0.26% chance of exploitation in the next 30 days, 16th percentile

Published

2026-04-02

Proof-of-concept exploits (1)

• advisories/GHSA-5crx-pfhq-4hgg

Security advisories

• thorsten/phpMyFAQ/security/advisories/GHSA-5crx-pfhq-4hgg
• thorsten/phpMyFAQ/releases/tag/4.1.1

References

• CVE Record
• NVD entry