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CVE-2026-81890— elFinder: CSRF in netmount allows forced FTP mounts and server-side FTP connections

Quick assessment

Affected
Studio-42 elFinder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

elFinder 是一个用 JavaScript 和 jQuery UI 编写的开源 Web 文件管理器。在 2.1.70 版本之前， 命令未被包含在 中的 数组中，因此对于这个会改变服务器状态的操作， 函数未被调用。在随软件分发的 默认配置中，FTP 网络挂载处于启用状态，且攻击者可控的协议、主机、路径、端口、用户名、密码、别名及选项参数，会通过 中的 函数流向 。因此，一个跨站请求可以在受害者的会话中持久化一个由攻击者指定的 FTP 挂载，导致 PHP 服务器连接到攻击者指定的 FTP 主机和端口，并在未携带

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-81890

Vulnerability Information
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Vulnerability Title
elFinder: CSRF in netmount allows forced FTP mounts and server-side FTP connections
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Studio-42 elFinder < 2.1.70 -

II. Public POCs for CVE-2026-81890

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III. Intelligence Information for CVE-2026-81890

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Other References for CVE-2026-81890 (4)

Same Patch Batch · Studio-42 · 2026-08-31 · 3 CVEs total

CVE-2026-81889 8.6 HIGH elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback
CVE-2026-81891 8.1 HIGH elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)

IV. Related Vulnerabilities

Same product: elFinder
Same vendor: Studio-42
Same weakness: CWE-352

V. Comments for CVE-2026-81890

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