CVE-2026-52891
Critical
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.
SeverityCritical
CVSS9.9
Exploit probability—
ProductWekan
PublishedJul 15, 2026
First seenJul 15, 2026
Weakness typeCWE-78OS command injectionCWE-88CWE-88
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wekan wekan | < 9.07 | — |
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