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CVE-2026-66397— phpMyFAQ before 4.1.6 Path Traversal via category image deletion

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 4.1.6 之前版本在更新类别时，未对 existing_image 字段中的路径遍历序列进行验证。攻击者通过利用 Image::delete() 函数中不足的路径清理，可以删除任意文件。具体而言，攻击者可删除 database.php 配置文件，以绕过安装限制并访问公开设置向导，从而创建新的超级管理员账户。

CVSS 8.6 · High EPSS 0.49% · P40

Affected Version Matrix 2

VendorProduct Version RangeStatus
thorsten phpMyFAQ < 4.1.6 affected
4.1.6 unaffected
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I. Basic Information for CVE-2026-66397

Vulnerability Information
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Vulnerability Title
phpMyFAQ before 4.1.6 Path Traversal via category image deletion
Source: CVE Program / CVE List V5
Vulnerability Description
phpMyFAQ before 4.1.6 fails to validate path traversal sequences in the existing_image field during category updates, allowing authenticated attackers to delete arbitrary files by exploiting insufficient sanitization in Image::delete(). Attackers can delete the database.php configuration file to disable the installation gate and access the public setup wizard to create new superadmin accounts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
thorsten phpMyFAQ 0 ~ 4.1.6 -

II. Public POCs for CVE-2026-66397

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 8485 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-66397

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Vendor Advisories for CVE-2026-66397 (2)

Same Patch Batch · thorsten · 2026-07-27 · 3 CVEs total

CVE-2026-66398 9.4 CRITICAL phpMyFAQ before 4.1.6 Remote Code Execution via Configuration API
CVE-2026-66399 6.5 MEDIUM phpMyFAQ before 4.1.6 Privilege Escalation via Group Membership

IV. Related Vulnerabilities

Same product: phpMyFAQ
Same vendor: thorsten
Same weakness: CWE-22

V. Comments for CVE-2026-66397

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