{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-104890", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-02T14:59:11.775Z", "datePublished": "2026-10-05T15:46:21.959Z", "dateUpdated": "2026-10-05T15:46:21.959Z"}, "containers": {"cna": {"title": "Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution", "problemTypes": [{"descriptions": [{"cweId": "CWE-434", "lang": "en", "description": "CWE-434: Unrestricted Upload of File with Dangerous Type", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq"}, {"name": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3", "tags": ["x_refsource_MISC"], "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3"}, {"name": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2"}], "affected": [{"vendor": "Kunstmaan", "product": "KunstmaanBundlesCMS", "versions": [{"version": "< 7.3.1", "status": "affected"}]}, {"vendor": "kunstmaan", "product": "bundles-cms", "versions": [{"version": "< 7.3.1", "status": "affected"}]}, {"vendor": "kunstmaan", "product": "media-bundle", "versions": [{"version": "< 7.3.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-05T15:46:21.959Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-p279-5wcv-45vq", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "KunstmaanBundlesCMS", "vendor": "Kunstmaan", "versions": [{"status": "affected", "version": "< 7.3.1"}]}, {"product": "bundles-cms", "vendor": "kunstmaan", "versions": [{"status": "affected", "version": "< 7.3.1"}]}, {"product": "media-bundle", "vendor": "kunstmaan", "versions": [{"status": "affected", "version": "< 7.3.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-104890", "lastModified": "2026-10-05T16:17:06.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-05T16:17:06.270", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-434"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-10-05T17:30:11.280127+00:00", "updated": "2026-10-05T17:30:11.280133+00:00", "vendors": []}