{"id":"CVE-2026-55695","state":"PUBLISHED","title":"FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater","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.","publishedAt":"2026-10-13T15:51:02.854Z","updatedAt":"2026-10-13T16:12:15.791Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["fearlessgeekmedia FearlessCMS"],"affected":[{"vendor":"fearlessgeekmedia","product":"FearlessCMS","versions":[{"version":"< 0.1.3b","status":"affected"}]}],"references":["https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m","https://github.com/fearlessgeekmedia/FearlessCMS/pull/64","https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92","https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3"],"weaknesses":["CWE-94"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55695.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55695","state":"PUBLISHED","datePublished":"2026-10-13T15:51:02.854Z","dateUpdated":"2026-10-13T16:12:15.791Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-17T00:13:10.650Z"},"containers":{"cna":{"title":"FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"fearlessgeekmedia","product":"FearlessCMS","versions":[{"version":"< 0.1.3b","status":"affected"}]}],"references":[{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m","name":"https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/pull/64","name":"https://github.com/fearlessgeekmedia/FearlessCMS/pull/64","tags":["x_refsource_MISC"]},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92","name":"https://github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917af3cae97b191de92","tags":["x_refsource_MISC"]},{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3","name":"https://github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-94","lang":"en","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-13T15:51:02.854Z"},"source":{"advisory":"GHSA-56wm-3q3v-m93m","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3q3v-m93m","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-13T16:12:10.331076Z","id":"CVE-2026-55695","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-13T16:12:15.791Z"}}]}}}