CVE-2026-52891: Wekan

Critical severity, CVSS 9.9. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Wekan Wekan: before 9.07 (fixed in 9.07)

Published 2026-07-15. Last modified 2026-07-17.