What’s Vulnerable › Vulnerabilities

CVE-2026-81891: elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-31 · updated 2026-09-09
• Weakness: CWE-434

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.

Affected products

• Studio-42 elFinder: before 2.1.70

References

• https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ff
• https://github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb208365
• https://github.com/Studio-42/elFinder/releases/tag/2.1.70
• https://github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwq

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