What’s Vulnerable › Vulnerabilities

CVE-2026-46360: phpMyFAQ - Stored XSS via Entity Decoding Depth Limit Bypass in SVG Sanitizer

• 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: none known
• Published: 2026-05-15 · updated 2026-10-26
• Weakness: CWE-79

Description

phpMyFAQ before 4.1.2 contains a stored cross-site scripting vulnerability in SvgSanitizer::decodeAllEntities() that limits recursive entity decoding to 5 iterations, allowing attackers to bypass sanitization. Authenticated users with FAQ_EDIT permission can upload malicious SVG files with deeply nested ampersand encoding around numeric HTML entities to reconstruct javascript: URLs, which execute arbitrary JavaScript when clicked by other users viewing the uploaded SVG.

Affected products

• thorsten phpMyFAQ: before 4.1.2 — fixed in 4.1.2

How to fix

Upgrade to a fixed version: thorsten phpMyFAQ 4.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-whqh-9pq5-c7r3
• https://www.vulncheck.com/advisories/phpmyfaq-stored-xss-via-entity-decoding-depth-limit-bypass-in-svg-sanitizer
• https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-whqh-9pq5-c7r3

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