Vulnerability 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::$csrfProtectedCmds in php/elFinderConnector.class.php, so validateCsrfToken() is not called for this state-changing operation. In the shipped php/connector.minimal.php-dist configuration, FTP network mounts are enabled by default, and attacker-controlled protocol, host, path, port, user, pass, alias, and options arguments flow through elFinder::netmount() in php/elFinder.class.php to php/elFinderVolumeFTP.class.php. A cross-site request can therefore persist an attacker-chosen FTP mount in the victim's session, cause the PHP server to connect to an attacker-chosen FTP host and port, and send supplied credentials without an X-elFinder-CSRF token. This issue is fixed in version 2.1.70.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/Studio-42/elFinder/commit/31284facd033e081b2b69c08873b39c8a41
- https://github.com/Studio-42/elFinder/commit/36d40fff12222ad4c229d8889d8ed3fd3db
- https://github.com/Studio-42/elFinder/releases/tag/2.1.70
- https://github.com/Studio-42/elFinder/security/advisories/GHSA-9hjf-w35w-6vx2
- https://github.com/Studio-42/elFinder/security/advisories/GHSA-9hjf-w35w-6vx2
FAQ
What is CVE-2026-81890?
CVE-2026-81890 is a vulnerability with a CVSS score of 5.4 (MEDIUM). elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, the netmount command is omitted from elFinderConnector::$csrfProtectedCmds in php/elFinderConne...
How severe is CVE-2026-81890?
CVE-2026-81890 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-81890?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.