CVE-2026-81891elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)
Updated under an hour ago ()
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It affects Studio-42 elFinder. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-434
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Studio-42 elFinder studio_42:elfinder (from the name) | before 2.1.70 | CNA record |
References
- https://github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwqx-refsource-confirm
- https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ffx-refsource-misc
- https://github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb208365x-refsource-misc
- https://github.com/Studio-42/elFinder/releases/tag/2.1.70x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.