{"api_version":"1","generated_at":"2026-09-01T05:07:10+00:00","cve":"CVE-2026-81891","urls":{"html":"https://cve.report/CVE-2026-81891","api":"https://cve.report/api/cve/CVE-2026-81891.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-81891","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-81891"},"summary":{"title":"elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)","description":"elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, checkExtractItems() in php/elFinderVolumeDriver.class.php calls mimetypeInternalDetect() without passing the result through mimeTypeNormalize(). Because the .phtml, .phar, .php5, and .php3 extensions are absent from mime.types, the staticMimeMap entries that map them to text/x-php are not applied, and allowPutMime() permits extraction even when uploadDeny blocks text/x-php. An attacker with ZIP upload permission can extract PHP-executable files into a web-accessible files/ directory and achieve remote code execution when the server executes those extensions. This issue is fixed in version 2.1.70.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-08-31 21:17:52","updated_at":"2026-08-31 21:17:52"},"problem_types":["CWE-434","CWE-434 CWE-434: Unrestricted Upload of File with Dangerous Type"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"8.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ff","name":"https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ff","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/Studio-42/elFinder/releases/tag/2.1.70","name":"https://github.com/Studio-42/elFinder/releases/tag/2.1.70","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb208365","name":"https://github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb208365","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwq","name":"https://github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwq","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81891","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81891","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Studio-42","product":"elFinder","version":"affected < 2.1.70","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"elFinder","vendor":"Studio-42","versions":[{"status":"affected","version":"< 2.1.70"}]}],"descriptions":[{"lang":"en","value":"elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, checkExtractItems() in php/elFinderVolumeDriver.class.php calls mimetypeInternalDetect() without passing the result through mimeTypeNormalize(). Because the .phtml, .phar, .php5, and .php3 extensions are absent from mime.types, the staticMimeMap entries that map them to text/x-php are not applied, and allowPutMime() permits extraction even when uploadDeny blocks text/x-php. An attacker with ZIP upload permission can extract PHP-executable files into a web-accessible files/ directory and achieve remote code execution when the server executes those extensions. This issue is fixed in version 2.1.70."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-434","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-31T20:33:22.283Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwq"},{"name":"https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ff","tags":["x_refsource_MISC"],"url":"https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ff"},{"name":"https://github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb208365","tags":["x_refsource_MISC"],"url":"https://github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb208365"},{"name":"https://github.com/Studio-42/elFinder/releases/tag/2.1.70","tags":["x_refsource_MISC"],"url":"https://github.com/Studio-42/elFinder/releases/tag/2.1.70"}],"source":{"advisory":"GHSA-gxmj-r5rf-ggwq","discovery":"UNKNOWN"},"title":"elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-81891","datePublished":"2026-08-31T20:33:22.283Z","dateReserved":"2026-08-27T17:48:42.123Z","dateUpdated":"2026-08-31T20:33:22.283Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-31 21:17:52","lastModifiedDate":"2026-08-31 21:17:52","problem_types":["CWE-434","CWE-434 CWE-434: Unrestricted Upload of File with Dangerous Type"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"81891","Ordinal":"1","Title":"elFinder: ZIP extraction bypasses uploadDeny MIME filter allowin","CVE":"CVE-2026-81891","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"81891","Ordinal":"1","NoteData":"elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, checkExtractItems() in php/elFinderVolumeDriver.class.php calls mimetypeInternalDetect() without passing the result through mimeTypeNormalize(). Because the .phtml, .phar, .php5, and .php3 extensions are absent from mime.types, the staticMimeMap entries that map them to text/x-php are not applied, and allowPutMime() permits extraction even when uploadDeny blocks text/x-php. An attacker with ZIP upload permission can extract PHP-executable files into a web-accessible files/ directory and achieve remote code execution when the server executes those extensions. This issue is fixed in version 2.1.70.","Type":"Description","Title":"elFinder: ZIP extraction bypasses uploadDeny MIME filter allowin"}]}}}