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9.1
CVE-2026-55695: FearlessCMS admin can load malicious updates and run code
CVE-2026-55695 · published today
Summary
In versions up to 0.1.2b, a logged‑in admin can enter any Git repository address for updates. The system blindly clones that repository and overwrites core folders, allowing an attacker to place PHP files that run with the web server’s rights. Upgrade to version 0.1.3b or later, or restrict update URLs to trusted repositories, to stop this risk.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| fearlessgeekmedia | fearlesscms | < 0.1.3b |
Original advisory text
FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater
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.
References
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Type
CWE-94Code Injection
Timeline
Published13 Oct 2026
Updated13 Oct 2026
First seen13 Oct 2026
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