CVE-2026-41247: elFinder: Command injection in resize background color parameter when using ImageMagick CLI

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-23 · updated 2026-10-26
Weakness: CWE-78

Description

elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.67, elFinder contains a command injection vulnerability in the resize command. The bg (background color) parameter is accepted from user input and passed through image resize/rotate processing. In configurations that use the ImageMagick CLI backend, this value is incorporated into shell command strings without sufficient escaping. An attacker able to invoke the resize command with a crafted bg value may achieve arbitrary command execution as the web server process user. This vulnerability is fixed in 2.1.67.

Affected products

Studio-42 elFinder: before 2.1.67 — fixed in 2.1.67

How to fix

Upgrade to a fixed version: Studio-42 elFinder 2.1.67. Check the vendor advisory for mitigations.

References

https://github.com/Studio-42/elFinder/security/advisories/GHSA-8q4h-8crm-5cvc

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