thorsten phpMyFAQ up to 4.1.0 SVG SvgSanitizer.php edit_faq cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in thorsten phpMyFAQ up to 4.1.0. This affects the function edit_faq of the file SvgSanitizer.php of the component SVG Handler. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2026-34974. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in thorsten phpMyFAQ up to 4.1.0. It has been declared as problematic. Affected by this vulnerability is the function edit_faq of the file SvgSanitizer.php of the component SVG Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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 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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-34974 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

By approaching the search of inurl:SvgSanitizer.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.1.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Type

• Content Management System

Vendor

• thorsten

Name

• phpMyFAQ

Version

• 4.0
• 4.1.0

License

• open-source

Website

• Product: https://github.com/thorsten/phpMyFAQ/

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