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CVE-2026-27836— phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

Quick assessment

Affected
thorsten phpMyFAQ
Exploitation
Public or AI PoC available; prioritize validation
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 4.0.18之前版本存在安全漏洞，该漏洞源于WebAuthn prepare端点缺少身份验证和CSRF保护，可能导致未经验证的攻击者创建无限用户账户。

CVSS 7.5 · High EPSS 0.49% · P41
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I. Basic Information for CVE-2026-27836

Vulnerability Information
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Vulnerability Title
phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ is an open source FAQ web application. Prior to version 4.0.18, the WebAuthn prepare endpoint (`/api/webauthn/prepare`) creates new active user accounts without any authentication, CSRF protection, captcha, or configuration checks. This allows unauthenticated attackers to create unlimited user accounts even when registration is disabled. Version 4.0.18 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 4.0.18之前版本存在安全漏洞，该漏洞源于WebAuthn prepare端点缺少身份验证和CSRF保护，可能导致未经验证的攻击者创建无限用户账户。
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 < 4.0.18 -

II. Public POCs for CVE-2026-27836

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7703 chars
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III. Intelligence Information for CVE-2026-27836

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Patches & Fixes for CVE-2026-27836 (1)

Vendor Advisories for CVE-2026-27836 (1)

IV. Related Vulnerabilities

Same product: phpMyFAQ
Same vendor: thorsten
Same weakness: CWE-862

V. Comments for CVE-2026-27836

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