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

Quick assessment

Affected
thorsten phpMyFAQ
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

phpMyFAQ是Thorsten Rinne个人开发者的一个多语言、完全由数据库驱动的常见问题解答系统。 phpMyFAQ 4.1.1之前版本存在安全漏洞，该漏洞源于SVG清理器可被绕过，可能导致执行任意JavaScript代码和权限提升。

CVSS 5.4 · Medium EPSS 0.26% · P16
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I. Basic Information for CVE-2026-34974

Vulnerability Information
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Vulnerability Title
phpMyFAQ: SVG Sanitizer Bypass via HTML Entity Encoding leads to Stored XSS and Privilege Escalation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
phpMyFAQ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
phpMyFAQ是Thorsten Rinne个人开发者的一个多语言、完全由数据库驱动的常见问题解答系统。 phpMyFAQ 4.1.1之前版本存在安全漏洞，该漏洞源于SVG清理器可被绕过，可能导致执行任意JavaScript代码和权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
thorsten phpMyFAQ < 4.1.1 -

II. Public POCs for CVE-2026-34974

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III. Intelligence Information for CVE-2026-34974

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Vendor Advisories for CVE-2026-34974 (1)

Same Patch Batch · thorsten · 2026-04-02 · 5 CVEs total

CVE-2026-34728 8.7 HIGH phpMyFAQ: Path Traversal - Arbitrary File Deletion in MediaBrowserController
CVE-2026-34729 6.1 MEDIUM phpMyFAQ: Stored XSS via Regex Bypass in Filter::removeAttributes()
CVE-2026-32629 phpMyFAQ: Stored XSS via Unsanitized Email Field in Admin FAQ Editor
CVE-2026-34973 phpMyFAQ has a LIKE Wildcard Injection in Search.php — Unescaped % and _ Metacharacters En

IV. Related Vulnerabilities

Same product: phpMyFAQ
Same vendor: thorsten
Same weakness: CWE-79

V. Comments for CVE-2026-34974

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