elFinder: CSRF in netmount allows forced FTP mounts and server-side FTP connections
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-352.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Studio-42 | elFinder | before 2.1.70 | 2.1.70 | Patch available | CNA |
| — | studio-42/elfinder (Packagist) | before 2.1.70 | 2.1.70 | Patch available | GHSA-9hjf-w35w-6vx2 |
- elFinder VendorStudio-42 Affected before 2.1.70 Fixed in 2.1.70 Patch available CNA
- studio-42/elfinder (Packagist) Vendor— Affected before 2.1.70 Fixed in 2.1.70 Patch available GHSA-9hjf-w35w-6vx2
Remediation
- Fix · CNA elFinder (Studio-42) Fixed in 2.1.70
- Fix · GHSA-9hjf-w35w-6vx2 studio-42/elfinder (Packagist) Fixed in 2.1.70 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-81890
- 2026-10-03 Alias added: GHSA-9hjf-w35w-6vx2
References
Other 5
- 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
- https://github.com/Studio-42/elFinder
More Studio-42 vulnerabilities
- TI-2026-56500 elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback CVSS 3.1HIGH 8.6
- TI-2026-32450 elFinder: SQL Injection MySQL Volume Driver (elFinderVolumeMySQL) CVSS 3.1HIGH 8.8
- TI-2026-56502 elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE) CVSS 3.1HIGH 8.1
Sources
- CVE-2026-81890 · CVE Program
- CVE-2026-81890 · NVD
- FIRST EPSS
- GHSA-9hjf-w35w-6vx2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences