Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
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
FAQ
What is CVE-2026-52891?
CVE-2026-52891 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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. ...
How severe is CVE-2026-52891?
CVE-2026-52891 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-52891?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.