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CVE-2026-85591— phpMyFAQ before 4.1.8 Authentication Bypass via Unverified Password Change

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之前版本存在授权问题漏洞，该漏洞源于用户控制面板API端点存在身份验证绕过漏洞，允许已认证攻击者仅凭CSRF令牌向用户数据更新端点提交PUT请求，无需验证当前密码即可静默更改任何用户（包括管理员）的密码，导致账户接管和受害者锁定。

CVSS 7.1 · High EPSS 0.52% · P43

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-2026-85591

Vulnerability Information
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Vulnerability Title
phpMyFAQ before 4.1.8 Authentication Bypass via Unverified Password Change
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ versions before 4.1.8 contain an authentication bypass vulnerability in the user control panel API endpoint that allows authenticated attackers to change account passwords without verifying the current password. Attackers with session access can submit a PUT request to the user data update endpoint with only a CSRF token to silently change any user's password, including administrators, causing irreversible account takeover and victim lockout.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经验证的口令修改
Source: CVE Program / CVE List V5
Vulnerability Title
phpMyFAQ 授权问题漏洞
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之前版本存在授权问题漏洞，该漏洞源于用户控制面板API端点存在身份验证绕过漏洞，允许已认证攻击者仅凭CSRF令牌向用户数据更新端点提交PUT请求，无需验证当前密码即可静默更改任何用户（包括管理员）的密码，导致账户接管和受害者锁定。
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-2026-85591

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III. Intelligence Information for CVE-2026-85591

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Vendor Advisories for CVE-2026-85591 (2)

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

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-2026-85593 5.4 MEDIUM phpMyFAQ before 4.1.8 Stored XSS via html_entity_decode
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-620

V. Comments for CVE-2026-85591

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