CVE-2026-52891: Wekan: Shell Injection via Avatar Upload
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 childprocess.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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Wekanto a version that resolves this vulnerability.Fixed in 9.07
Event History
Frequently Asked Questions
What is the severity of CVE-2026-52891?
The severity of CVE-2026-52891 is rated as critical with a score of 9.9.
How do I fix CVE-2026-52891?
To fix CVE-2026-52891, upgrade to Wekan version 9.07 or later.
What type of vulnerability is CVE-2026-52891?
CVE-2026-52891 is classified as an OS Command Injection vulnerability.
What is the risk level associated with CVE-2026-52891?
CVE-2026-52891 has a risk level of 82.
What functionality is affected by CVE-2026-52891?
CVE-2026-52891 affects the avatar upload functionality in Wekan.