CVE-2026-81890
elFinder: CSRF in netmount allows forced FTP mounts and server-side FTP connections
- State
- Published
- Severity
- 5.4 Medium
- Published
- Aug 31, 2026
- Updated
- Sep 1, 2026
- Reserved
- Aug 27, 2026
Description
elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, the netmount command is omitted from elFinderConnector::$csrfProtectedCmds in php/elFinderConnector.class.php, so validateCsrfToken() is not called for this state-changing operation. In the shipped php/connector.minimal.php-dist configuration, FTP network mounts are enabled by default, and attacker-controlled protocol, host, path, port, user, pass, alias, and options arguments flow through elFinder::netmount() in php/elFinder.class.php to php/elFinderVolumeFTP.class.php. A cross-site request can therefore persist an attacker-chosen FTP mount in the victim's session, cause the PHP server to connect to an attacker-chosen FTP host and port, and send supplied credentials without an X-elFinder-CSRF token. This issue is fixed in version 2.1.70.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N | GitHub_M |
Weaknesses
- CWE-352 Cross-Site Request Forgery (CSRF)
Affected Products
| Product | Versions |
|---|---|
elFinderStudio-42 |
|
References
- https://github.com/Studio-42/elFinder/security/advisories/GHSA-9hjf-w35w-6vx2
- https://github.com/Studio-42/elFinder/commit/31284facd033e081b2b69c08873b39c8a413b762
- https://github.com/Studio-42/elFinder/commit/36d40fff12222ad4c229d8889d8ed3fd3dbf0415
- https://github.com/Studio-42/elFinder/releases/tag/2.1.70
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