CVE-2026-81889

01/Description

elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, elFinder URL uploads in php/elFinder.class.php can bypass server-side request forgery protections when PHP cURL is unavailable because validate_address() validates $info['ip'], but get_remote_contents() selects fsock_get_contents(), which connects to $arr['host'] and performs a second DNS resolution. An attacker able to submit a URL upload can use DNS rebinding to have the first resolution return a public address and the connection resolution return a loopback or private address, causing the internal HTTP response body to be stored as an uploaded file and made readable through elFinder. After a successful fetch, get_headers($url, true) separately requests the original hostname without reusing the validated and pinned connection, creating an additional blind server-side request forgery path even when curl_get_contents() is selected. This issue is fixed in version 2.1.70.

02/References5

• github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a8…
• github.com/Studio-42/elFinder/commit/6d997386cd0f1abab4706c220b…
• github.com/Studio-42/elFinder/releases/tag/2.1.70
• github.com/Studio-42/elFinder/security/advisories/GHSA-8x3q-jpj…
• github.com/Studio-42/elFinder/security/advisories/GHSA-8x3q-jpj…