Vulnerability · Published Apr 2, 2026 · Assigned by GitHub_M

CVE-2026-34974phpMyFAQ: SVG Sanitizer Bypass via HTML Entity Encoding leads to Stored XSS and Privilege Escalation

Medium 5.4

In plain English

A medium-severity cross-site scripting in phpMyFAQ from thorsten. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 92.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	thorsten/phpmyfaq	4.1.1	GHSA-5crx-pfhq-4hgg

Affected products (as reported)

Vendor	Product	Versions
thorsten	phpMyFAQ	< 4.1.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-5crx-pfhq-4hgg x_refsource_CONFIRM
https://github.com/thorsten/phpMyFAQ/releases/tag/4.1.1 x_refsource_MISC