{"id":"CVE-2026-104890","title":"Kunstmaan CMS is an open source content management system based on the Symfony framework","summary":"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::ge…","severity":"high","cvss":7.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-434"],"vendor":"Kunstmaan","product":"KunstmaanBundlesCMS","affected":["KunstmaanBundlesCMS < 7.3.1","bundles-cms < 7.3.1","media-bundle < 7.3.1"],"published":"2026-10-05","updated":"2026-10-05","sourceUpdated":"2026-10-05T16:17:06.270","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-104890","references":[{"url":"https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3","label":"security-advisories@github.com"},{"url":"https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2","label":"security-advisories@github.com"},{"url":"https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-05T16:25:58.410Z","slug":"CVE-2026-104890","body":"## Overview\n\nKunstmaan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":39.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}