{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53599","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-09T19:39:52.404Z","datePublished":"2026-07-31T19:43:15.663Z","dateUpdated":"2026-07-31T21:39:28.144Z"},"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","problemTypes":[{"descriptions":[{"cweId":"CWE-434","lang":"en","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","type":"CWE"}]}],"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"}}],"references":[{"name":"https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25","tags":["x_refsource_CONFIRM"],"url":"https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25"},{"name":"https://github.com/redaxo/core/pull/6538","tags":["x_refsource_MISC"],"url":"https://github.com/redaxo/core/pull/6538"},{"name":"https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340","tags":["x_refsource_MISC"],"url":"https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340"},{"name":"https://github.com/redaxo/core/releases/tag/5.21.1","tags":["x_refsource_MISC"],"url":"https://github.com/redaxo/core/releases/tag/5.21.1"}],"affected":[{"vendor":"redaxo","product":"core","versions":[{"version":">= 5.18.2, < 5.21.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-31T19:43:15.663Z"},"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."}],"source":{"advisory":"GHSA-98pp-vccm-qm25","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-31T21:39:28.144Z"}}]}}