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CVE-2026-76214— phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge

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.

Thorsten Rinne phpMyFAQ是Thorsten Rinne个人开发者的一款常见问题解答管理系统。 Thorsten Rinne phpMyFAQ 4.1.7之前版本存在授权问题漏洞，该漏洞源于WebAuthn控制器未将修改后的密钥对象保存回数据库，导致登录挑战未持久化，防重放比较被空值保护跳过，可能导致攻击者重放捕获的WebAuthn断言，无需交互或硬件密钥即可冒充用户身份进行身份验证。

CVSS 7.4 · High EPSS 0.29% · P22

Affected Version Matrix 2

VendorProduct Version RangeStatus
thorsten phpMyFAQ < 4.1.7 affected
4.1.7 unaffected
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I. Basic Information for CVE-2026-76214

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ before 4.1.7 fails to persist the WebAuthn login challenge generated by prepareForLogin, because neither WebAuthn controller saves the mutated key objects back to the database. At login the anti-replay comparison is skipped by its own null guard, allowing an attacker who captures a successful WebAuthn assertion to replay it indefinitely and authenticate as the user without any interaction or hardware key.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Thorsten Rinne phpMyFAQ 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Thorsten Rinne phpMyFAQ是Thorsten Rinne个人开发者的一款常见问题解答管理系统。 Thorsten Rinne phpMyFAQ 4.1.7之前版本存在授权问题漏洞，该漏洞源于WebAuthn控制器未将修改后的密钥对象保存回数据库，导致登录挑战未持久化，防重放比较被空值保护跳过，可能导致攻击者重放捕获的WebAuthn断言，无需交互或硬件密钥即可冒充用户身份进行身份验证。
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 ~ 4.1.7 -

II. Public POCs for CVE-2026-76214

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10282 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-76214

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Vendor Advisories for CVE-2026-76214 (2)

Same Patch Batch · thorsten · 2026-08-19 · 14 CVEs total

CVE-2026-75918 8.8 HIGH phpMyFAQ before 4.1.7 Authentication Bypass via Tracking File
CVE-2026-76208 8.2 HIGH phpMyFAQ 3.1.0 through 4.1.6 Authentication Bypass via LDAP
CVE-2026-76205 8.1 HIGH phpMyFAQ before 4.1.7 SQL Injection via Glossary
CVE-2026-76207 8.1 HIGH phpMyFAQ before 4.1.7 2FA Bypass via Remember-Me Cookie
CVE-2026-76213 7.4 HIGH phpMyFAQ before 4.1.7 2FA Brute-Force via Session-Scoped Throttle
CVE-2026-76210 6.5 MEDIUM phpMyFAQ before v4.1.6 Local File Disclosure via PDF Export
CVE-2026-75919 5.3 MEDIUM phpMyFAQ before 4.1.7 Authentication Bypass via Setup API
CVE-2026-75920 5.3 MEDIUM phpMyFAQ before 4.1.6 Information Disclosure via Backup ZIP
CVE-2026-76206 5.3 MEDIUM phpMyFAQ before 4.1.7 Information Disclosure via PDF Export
CVE-2026-76215 5.3 MEDIUM phpMyFAQ before 4.1.7 Missing Authorization via child resources
CVE-2026-76212 5.3 MEDIUM phpMyFAQ before 4.1.7 LIKE Wildcard Injection via PostgreSQL
CVE-2026-76209 4.3 MEDIUM phpMyFAQ before v4.1.6 Registration Bypass via API
CVE-2026-76211 4.3 MEDIUM phpMyFAQ before 4.1.7 Information Disclosure via Admin API

IV. Related Vulnerabilities

Same product: phpMyFAQ
Same vendor: thorsten
Same weakness: CWE-294

V. Comments for CVE-2026-76214

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