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CVE-2026-85593— phpMyFAQ before 4.1.8 Stored XSS via html_entity_decode

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是德国phpMyFAQ团队开源的一个常见问题解答管理系统。 phpMyFAQ 4.1.8之前版本存在跨站脚本漏洞，该漏洞源于FaqHelper::convertOldInternalLinks()调用html_entity_decode()对已清理的FAQ内容进行解码，导致实体编码保护被逆转，可能允许具有FAQ编辑权限的已认证用户注入JavaScript载荷，并在所有查看受影响FAQ页面的用户浏览器中执行。

CVSS 5.4 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 2

VendorProduct Version RangeStatus
thorsten phpMyFAQ < 4.1.8 affected
4.1.8 unaffected
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I. Basic Information for CVE-2026-85593

Vulnerability Information
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Vulnerability Title
phpMyFAQ before 4.1.8 Stored XSS via html_entity_decode
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ versions before 4.1.8 contain a stored cross-site scripting vulnerability in FaqHelper::convertOldInternalLinks() that calls html_entity_decode() on sanitized FAQ content, reversing entity-encoding protection. Authenticated users with FAQ editing privileges can inject JavaScript payloads that execute in the browsers of all users viewing the affected FAQ pages.
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 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
phpMyFAQ是德国phpMyFAQ团队开源的一个常见问题解答管理系统。 phpMyFAQ 4.1.8之前版本存在跨站脚本漏洞，该漏洞源于FaqHelper::convertOldInternalLinks()调用html_entity_decode()对已清理的FAQ内容进行解码，导致实体编码保护被逆转，可能允许具有FAQ编辑权限的已认证用户注入JavaScript载荷，并在所有查看受影响FAQ页面的用户浏览器中执行。
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 0 ~ 4.1.8 -

II. Public POCs for CVE-2026-85593

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III. Intelligence Information for CVE-2026-85593

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Vendor Advisories for CVE-2026-85593 (2)

Same Patch Batch · thorsten · 2026-09-04 · 8 CVEs total

CVE-2026-85591 7.1 HIGH phpMyFAQ before 4.1.8 Authentication Bypass via Unverified Password Change
CVE-2026-85590 7.1 HIGH phpMyFAQ before 4.1.8 Authentication Bypass via Two-Factor Disable
CVE-2026-85586 6.9 MEDIUM phpMyFAQ before 4.1.8 CAPTCHA Bypass via store parameter
CVE-2026-85587 5.3 MEDIUM phpMyFAQ before 4.1.8 Incorrect Authorization via Admin Pages
CVE-2026-85588 5.3 MEDIUM phpMyFAQ before 4.1.8 TOTP Secret Exposure via Data Export
CVE-2026-85589 5.3 MEDIUM phpMyFAQ before 4.2.0-alpha.2 Missing Authorization via Dashboard API
CVE-2026-85592 3.7 LOW phpMyFAQ before 4.1.8 Authorization Bypass via question/create

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-85593

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