What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-79

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 products

• thorsten phpMyFAQ: before 4.1.1 — fixed in 4.1.1

How to fix

Upgrade to a fixed version: thorsten phpMyFAQ 4.1.1. Check the vendor advisory for mitigations.

References

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

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