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CVE-2026-111909— phpMyFAQ before 4.1.9 Missing Authorization Allows Superadmin Deletion via deleteUser API

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 4.1.9 之前的版本在 deleteUser() API 中存在缺少授权检查的漏洞。该漏洞允许拥有 delete_user 权限的非超级管理员（non-superadmin）已认证用户删除超级管理员账户。攻击者可向 /admin/api/user/delete 发送 DELETE 请求，并指定除 ID 为 1 之外的超级管理员 userId，从而移除系统的管理访问权限和问责机制。

CVSS 8.1 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
thorsten phpMyFAQ < 4.1.9 affected
4.1.9 unaffected
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I. Basic Information for CVE-2026-111909

Vulnerability Information
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Vulnerability Title
phpMyFAQ before 4.1.9 Missing Authorization Allows Superadmin Deletion via deleteUser API
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ before 4.1.9 contains a missing authorization vulnerability in the deleteUser() API that allows authenticated non-superadmin users with delete_user permission to delete superadmin accounts. Attackers can send a DELETE request to /admin/api/user/delete with a superadmin's userId other than 1, removing administrative access and accountability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
thorsten phpMyFAQ 0 ~ 4.1.9 -

II. Public POCs for CVE-2026-111909

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III. Intelligence Information for CVE-2026-111909

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Vendor Advisories for CVE-2026-111909 (2)

Same Patch Batch · thorsten · 2026-10-17 · 28 CVEs total

CVE-2026-111911 9.8 CRITICAL phpMyFAQ 4.0.0 before 4.1.9 Authentication Bypass via WebAuthn Credential Injection
CVE-2026-111908 8.3 HIGH phpMyFAQ 4.0.0 before 4.1.9 and 4.2.0-alpha before 4.2.0-beta BOLA in FAQ Update via REST
CVE-2026-111884 8.3 HIGH phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta Missing Current-Password Step-Up o
CVE-2026-111882 8.1 HIGH phpMyFAQ 3.2.0-alpha before 4.1.9 and 4.2.0-alpha before 4.2.0-beta TOTP 2FA Bypass via SS
CVE-2026-111901 7.5 HIGH phpMyFAQ 4.2.0-alpha before 4.2.0-beta Unauthenticated DoS via API Pagination
CVE-2026-111898 7.5 HIGH phpMyFAQ 4.2.0-alpha before 4.2.0-beta Account Takeover via Keycloak Implicit Account Link
CVE-2026-111907 7.1 HIGH phpMyFAQ 4.0.0 before 4.1.9 CSRF via /admin/api/update-database
CVE-2026-111897 7.1 HIGH phpMyFAQ 4.2.0-alpha before 4.2.0-beta Authorization Bypass in Attachment Administration E
CVE-2026-111895 6.8 MEDIUM phpMyFAQ 3.2.0 before 4.0.0 and 4.0.2 before 4.2.0-beta Account Takeover via Entra ID pref
CVE-2026-111910 6.5 MEDIUM phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta Authorization Bypass via attachmen
CVE-2026-111886 6.5 MEDIUM phpMyFAQ 4.2.0-alpha.2 before 4.2.0-beta 2FA Brute-Force via remove-twofactor Endpoint
CVE-2026-111892 6.5 MEDIUM phpMyFAQ 4.2.0-alpha before 4.2.0-beta Missing Rate Limiting on Password-Reset Endpoints
CVE-2026-111893 6.5 MEDIUM phpMyFAQ 4.2.0-alpha before 4.2.0-beta Privilege Escalation via Group Category Restriction
CVE-2026-111906 6.5 MEDIUM phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta CSRF in Elasticsearch/OpenSearch A
CVE-2026-111905 6.0 MEDIUM phpMyFAQ 3.2.0 before 4.1.9 and 4.2.0-alpha before 4.2.0-beta IDOR Leaks TOTP Secret via /
CVE-2026-111891 5.5 MEDIUM phpMyFAQ from 4.2.0-alpha.2 before 4.2.0-beta Privilege Escalation via Group Permissions A
CVE-2026-111890 5.5 MEDIUM phpMyFAQ 4.2.0-alpha.2 before 4.2.0-beta Privilege Escalation via updateUserRights
CVE-2026-111885 5.5 MEDIUM phpMyFAQ 4.2.0-alpha before 4.2.0-beta Missing Authorization via deleteGroup API
CVE-2026-111896 5.4 MEDIUM phpMyFAQ 4.2.0-alpha before 4.2.0-beta Stored XSS via SVG Upload Sanitizer Bypass
CVE-2026-111894 5.4 MEDIUM phpMyFAQ 3.2.1 before 4.1.9 and 4.2.0-alpha before 4.2.0-beta Stored XSS via iframe data:

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: phpMyFAQ
Same vendor: thorsten
Same weakness: CWE-269

V. Comments for CVE-2026-111909

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