CVE-2026-55695 FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater
An authenticated administrator can achieve remote code execution by specifying a malicious Git repository URL in the system updater, allowing arbitrary PHP execution.
- 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-2026-55695?
CVE-2026-55695 is a critical code injection vulnerability in fearlessgeekmedia FearlessCMS, published on 13 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
FearlessCMS is a flat-file content management system centered on simplicity and open source. In 0.1.2b and earlier, an authenticated administrator can set an arbitrary Git repository URL through admin/updater-handler.php and trigger perform_update, which passes the URL to update.sh. The updater clones the repository and replaces the live plugins/, admin/, and includes/ directories without verifying the repository's identity, signatures, or contents. Because router.php permits existing PHP files under plugins to be executed by the PHP development server, attacker-supplied update content can execute arbitrary PHP with the web server process's privileges and persist as a backdoor. This issue is fixed in version 0.1.3b.
Weakness: CWE-94
Which versions are affected by CVE-2026-55695?
How do I fix CVE-2026-55695?
No fix has been published for CVE-2026-55695 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-2026-55695 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55695 exists.
Sources
Also known as GHSA-56wm-3q3v-m93m.