{"id":"CVE-2026-55695","title":"FearlessCMS is a flat-file content management system centered on simplicity and open source","summary":"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 perf…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-94"],"published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T17:17:42.283","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55695","references":[{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92","label":"security-advisories@github.com"},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/pull/64","label":"security-advisories@github.com"},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3","label":"security-advisories@github.com"},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m","label":"security-advisories@github.com"},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"ingestedAt":"2026-10-13T16:35:46.743Z","slug":"CVE-2026-55695","body":"## Overview\n\nFearlessCMS 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}