CVE-2026-52891: Wekan: Malicious Avatar Upload Can Execute Commands

Summary

Wekan, an open source project management tool, allows attackers to execute commands on the server by uploading a malicious avatar with special characters. This can lead to unauthorized access and system compromise. To fix this issue, update to version 9.07 or later.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions
wekan	wekan	< 9.07

Original title

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 detectio...

Original 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.

mitre CVSS3.1 9.9

Vulnerability type

CWE-78 OS Command Injection

CWE-88

https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g x_refsource_CONFIRM
https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9 x_refsource_MISC
https://github.com/wekan/wekan/releases/tag/v9.07 x_refsource_MISC