CVE-2026-55695FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater
Updated under an hour ago ()
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It affects fearlessgeekmedia FearlessCMS. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.46%, higher than 39% of scored CVEs.
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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.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.46% (percentile 39)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Oct 13, 2026
- First seen by InfoSec Signals
- Oct 13, 2026
Affected products
fearlessgeekmedia FearlessCMS fearlessgeekmedia:fearlesscms (from the name) | before 0.1.3b | CNA record |
References
- https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93mx-refsource-confirm
- https://github.com/fearlessgeekmedia/FearlessCMS/pull/64x-refsource-misc
- https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92x-refsource-misc
- https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.