Studio-42 elFinder up to 2.1.69 CSRF Token Validation elFinderConnector.class.php validateCsrfToken protocol/host/path/port/user/pass/alias/options cross-site request forgery

Summaryinfo

A vulnerability was found in Studio-42 elFinder up to 2.1.69. It has been classified as problematic. Impacted is the function validateCsrfToken of the file php/elFinderConnector.class.php of the component CSRF Token Validation. Performing a manipulation of the argument protocol/host/path/port/user/pass/alias/options results in cross-site request forgery. This vulnerability is cataloged as CVE-2026-81890. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Studio-42 elFinder up to 2.1.69. This affects the function validateCsrfToken of the file php/elFinderConnector.class.php of the component CSRF Token Validation. The manipulation of the argument protocol/host/path/port/user/pass/alias/options with an unknown input leads to a cross-site request forgery vulnerability. CWE is classifying the issue as CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-81890 since 08/27/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

By approaching the search of inurl:php/elFinderConnector.class.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.1.70 eliminates this vulnerability.

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Productinfo

Vendor

• Studio-42

Name

• elFinder

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.1.17
• 2.1.18
• 2.1.19
• 2.1.20
• 2.1.21
• 2.1.22
• 2.1.23
• 2.1.24
• 2.1.25
• 2.1.26
• 2.1.27
• 2.1.28
• 2.1.29
• 2.1.30
• 2.1.31
• 2.1.32
• 2.1.33
• 2.1.34
• 2.1.35
• 2.1.36
• 2.1.37
• 2.1.38
• 2.1.39
• 2.1.40
• 2.1.41
• 2.1.42
• 2.1.43
• 2.1.44
• 2.1.45
• 2.1.46
• 2.1.47
• 2.1.48
• 2.1.49
• 2.1.50
• 2.1.51
• 2.1.52
• 2.1.53
• 2.1.54
• 2.1.55
• 2.1.56
• 2.1.57
• 2.1.58
• 2.1.59
• 2.1.60
• 2.1.61
• 2.1.62
• 2.1.63
• 2.1.64
• 2.1.65
• 2.1.66
• 2.1.67
• 2.1.68
• 2.1.69

Website

• Product: https://github.com/Studio-42/elFinder/

CPE 2.3info

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CPE 2.2info

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