{"id":"CVE-2026-104890","revision":"8d8ba70c5478459faa1e41ecbb15082b","records":[{"revision":"8d8ba70c5478459faa1e41ecbb15082b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-104890","aliases":[],"title":"Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution","description":"Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercases the stored extension afterward. An authenticated backend user with media access can upload a mixed-case executable extension such as PHP that bypasses the check and is stored in the web-accessible media directory with an executable lowercase extension. The default blacklist also omits several server-executable extension types, allowing the same code-execution impact where the web server executes uploaded files. This issue is fixed in version 7.3.2.","state":0,"publishedAt":"2026-10-05T15:46:21.959+00:00","modifiedAt":"2026-10-07T20:50:50.492+00:00","affected":[{"ecosystem":"Vendor product","name":"KunstmaanBundlesCMS","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Kunstmaan\",\n                    \"product\": \"KunstmaanBundlesCMS\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.3.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"bundles-cms","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"kunstmaan\",\n                    \"product\": \"bundles-cms\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.3.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"media-bundle","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"kunstmaan\",\n                    \"product\": \"media-bundle\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.3.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","score":7.2,"severity":"HIGH"}],"references":["https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq","https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3","https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-104890","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-104890","identifiers":["CVE-2026-104890"]},"retained":false,"historicalAffected":[]}],"coverage":[]}