CVE-2026-66398 phpMyFAQ before 4.1.6 Remote Code Execution via Configuration API
Authenticated administrators can achieve remote code execution by uploading a malicious ZIP and manipulating configuration settings to extract it into the application root.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66398?
CVE-2026-66398 is a critical code injection vulnerability in thorsten phpMyFAQ, published on 27 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-494
Which versions are affected by CVE-2026-66398?
How do I fix CVE-2026-66398?
No fix has been published for CVE-2026-66398 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-66398 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66398 exists.
Sources
Also known as GHSA-4fv7-8rr6-rf2w, GHSA-c4f8-v76x-mwx3.