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CVE-2026-56736— phpMyFAQ has Stored XSS in Admin FAQ Editor via HTML Entity Bypass in Frontend FAQ Submission

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 是一个开源的 FAQ 网站应用程序。在 4.2.0-alpha 之前的版本中存在一个存储型跨站脚本（XSS）漏洞，该漏洞允许任何未经身份验证的用户（或低权限注册用户）注入任意 JavaScript 代码，当管理员查看或编辑用户提交的 FAQ 条目时，这些脚本会在管理员的浏览器中执行。这会导致会话劫持，进而导致管理员账户被接管。漏洞的存在是因为 函数在 函数已经对 HTML 实体进行过滤后，仍将这些实体转换为可执行的 HTML。此外，管理员模板使用 Twig 的 过滤器渲染内容时，并未对输出进行任何

CVSS 8.2 · High EPSS 0.24% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
thorsten phpMyFAQ < 4.2.0-alpha affected
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I. Basic Information for CVE-2026-56736

Vulnerability Information
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Vulnerability Title
phpMyFAQ has Stored XSS in Admin FAQ Editor via HTML Entity Bypass in Frontend FAQ Submission
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ is an open source FAQ web application. A stored cross-site scripting (XSS) vulnerability in versions prior to 4.2.0-alpha allows any unauthenticated user (or low-privileged registered user) to inject arbitrary JavaScript that executes in an administrator's browser when they review or edit a user-submitted FAQ entry. This leads to admin account takeover via session theft. The vulnerability exists because `html_entity_decode()` converts HTML entities into executable HTML after `strip_tags()` has already passed them through, and the admin template renders the content with Twig's `|raw` filter without any output sanitization. Version 4.2.0-alpha fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
thorsten phpMyFAQ < 4.2.0-alpha -

II. Public POCs for CVE-2026-56736

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III. Intelligence Information for CVE-2026-56736

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Vendor Advisories for CVE-2026-56736 (1)

Same Patch Batch · thorsten · 2026-09-24 · 4 CVEs total

CVE-2026-56738 8.5 HIGH phpMyFAQ has SQL Injection in `StopWords::add()` — Unescaped Stop Word Insertion
CVE-2026-56737 8.1 HIGH phpMyFAQ's two-factor authentication login bypasses the password factor
CVE-2026-47132 5.4 MEDIUM phpMyFAQ: SQL LIKE Wildcard Injection in Chat User Search Allows Authenticated User Enumer

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-56736

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