{"id":"CVE-2026-55695","summary":"FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater","details":"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.","aliases":["GHSA-56wm-3q3v-m93m"],"modified":"2026-10-14T02:48:27.011010975Z","published":"2026-10-13T15:51:02.854Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55695.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-94"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55695.json"},{"type":"FIX","url":"https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92"},{"type":"FIX","url":"https://github.com/fearlessgeekmedia/FearlessCMS/pull/64"},{"type":"WEB","url":"https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3"},{"type":"ADVISORY","url":"https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55695"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fearlessgeekmedia/fearlesscms","events":[{"introduced":"0"},{"fixed":"a04281bac4b0a286df28723ed8291b1cd62f7447"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"0.1.3b"}]}}],"versions":["0.1.2","0.1.1","0.1.0","0.0.3-10","0.0.3-9","0.0.3-8","0.0.3-7","0.0.3-6","0.0.3-5","0.0.3-4","0.0.3-3","0.0.3-2","0.0.3-1","0.0.2-16","0.0.2-14","0.0.2-13","0.0.2-12","0.0.2-11","0.0.2-9","0.0.2-8","0.0.2-7","0.0.2-6","0.0.2-5","0.0.2-3","0.0.2-2","0.0.2-1","0.0.2","0.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55695.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"}]}