{"id":"CVE-2026-53599","state":"PUBLISHED","title":"Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers","description":"REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAllowedExtension in redaxo/src/addons/mediapool/lib/mediapool.php lets an authenticated backend user with media[upload] permission upload a JPEG/PHP polyglot named shell.php.any.jpg, which web servers with multi-extension PHP handlers can execute as the web-server user. This issue is fixed in version 5.21.1.","publishedAt":"2026-07-31T19:43:15.663Z","updatedAt":"2026-07-31T21:39:28.144Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["redaxo core"],"affected":[{"vendor":"redaxo","product":"core","versions":[{"version":">= 5.18.2, < 5.21.1","status":"affected"}]}],"references":["https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25","https://github.com/redaxo/core/pull/6538","https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340","https://github.com/redaxo/core/releases/tag/5.21.1"],"weaknesses":["CWE-434"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53599.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53599","state":"PUBLISHED","datePublished":"2026-07-31T19:43:15.663Z","dateUpdated":"2026-07-31T21:39:28.144Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-09T19:39:52.404Z"},"containers":{"cna":{"title":"Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers","descriptions":[{"lang":"en","value":"REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAllowedExtension in redaxo/src/addons/mediapool/lib/mediapool.php lets an authenticated backend user with media[upload] permission upload a JPEG/PHP polyglot named shell.php.any.jpg, which web servers with multi-extension PHP handlers can execute as the web-server user. This issue is fixed in version 5.21.1."}],"affected":[{"vendor":"redaxo","product":"core","versions":[{"version":">= 5.18.2, < 5.21.1","status":"affected"}]}],"references":[{"url":"https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25","name":"https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/redaxo/core/pull/6538","name":"https://github.com/redaxo/core/pull/6538","tags":["x_refsource_MISC"]},{"url":"https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340","name":"https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340","tags":["x_refsource_MISC"]},{"url":"https://github.com/redaxo/core/releases/tag/5.21.1","name":"https://github.com/redaxo/core/releases/tag/5.21.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-434","lang":"en","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-31T19:43:15.663Z"},"source":{"advisory":"GHSA-98pp-vccm-qm25","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T20:11:41.826930Z","id":"CVE-2026-53599","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":"2026-07-31T21:39:28.144Z"}}]}}}