What’s Vulnerable › Vulnerabilities

CVE-2026-66398: phpMyFAQ before 4.1.6 Remote Code Execution via Configuration API

• Severity: critical (CVSS 9.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-27 · updated 2026-10-24
• Weakness: CWE-494

Description

phpMyFAQ before v4.1.6 contains a remote code execution vulnerability in the configuration API that allows authenticated administrators with CONFIGURATION_EDIT and ATTACHMENT_ADD privileges to write arbitrary PHP files by manipulating the upgrade.lastDownloadedPackage setting. Attackers can upload a malicious ZIP file as an attachment, point the updater configuration to its stored path, and extract it into the application root to achieve code execution as the web server user.

Affected products

• thorsten phpMyFAQ: before 4.1.6 — fixed in 4.1.6

How to fix

Upgrade to a fixed version: thorsten phpMyFAQ 4.1.6. Check the vendor advisory for mitigations.

References

• https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-4fv7-8rr6-rf2w
• https://www.vulncheck.com/advisories/phpmyfaq-before-remote-code-execution-via-configuration-api
• https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-4fv7-8rr6-rf2w

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