Vulnerability · Published Aug 31, 2026 · Assigned by GitHub_M
CVE-2026-81890elFinder: CSRF in netmount allows forced FTP mounts and server-side FTP connections
Medium 5.4
In plain English
A medium-severity cross-site request forgery in elFinder from Studio-42. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | studio-42/elfinder | 2.1.70 | GHSA-9hjf-w35w-6vx2 |
Affected products (as reported)
Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
References
- https://github.com/Studio-42/elFinder/security/advisories/GHSA-9hjf-w35w-6vx2 x_refsource_CONFIRM
- https://github.com/Studio-42/elFinder/commit/31284facd033e081b2b69c08873b39c8a413b762 x_refsource_MISC
- https://github.com/Studio-42/elFinder/commit/36d40fff12222ad4c229d8889d8ed3fd3dbf0415 x_refsource_MISC
- https://github.com/Studio-42/elFinder/releases/tag/2.1.70 x_refsource_MISC