CVE-2026-55695
FearlessCMS is a flat-file content management system centered on simplicity and open source
- Risk score
- 62/100
- CVSS
- 9.1 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 a…
- Affected
- See advisory
- Fix
- Upgrade the product to 0.1.3 or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.1 critical
References
- https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92
- https://github.com/fearlessgeekmedia/FearlessCMS/pull/64
- https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3
- https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m
- https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m
Original 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.
Last activity 13 Oct 2026. Patch Forecast updates every hour.