CVE-2026-52891

critical · 9.9

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.

9.9

CVSS

0.8%

EPSS (exploit prob.)

55th

EPSS percentile

2026-07-15

Published

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-78CWE-88

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-52891