VULNERABILITY INTELLIGENCE

CVE-2026-52891

CVSS score9.9 CRITICAL
EPSS probability0.78%
CISA KEVNot currently listed
Published2026-07-15
Last modified2026-07-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Description

Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar filename, shell metacharacters such as backticks and $() in the filename could execute commands on the server. This issue is fixed in version 9.07.

Weakness classification

  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Primary references