elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81891
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-31 21:17:52 UTC
Updated2026-08-31 21:17:52 UTC
DescriptionelFinder 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-434 | CWE-434 CWE-434: Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Studio-42 ElFinder affected < 2.1.70 Not specified

References

ReferenceSourceLinkTags
github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861... [email protected] github.com
github.com/Studio-42/elFinder/releases/tag/2.1.70 [email protected] github.com
github.com/Studio-42/elFinder/commit/dd73e702820c146a192969800ee674ecdb2... [email protected] github.com
github.com/Studio-42/elFinder/security/advisories/GHSA-gxmj-r5rf-ggwq [email protected] github.com
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