RCE in Wekan
CVE-2026-52891
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.008 (53.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Wekan — versions < 9.07
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-52891?
- CVE-2026-52891 is a critical-severity vulnerability in Wekan, classified under OS Command Injection. CVSS score: 9.9/10. Published 2026-07-15.
- How severe is CVE-2026-52891?
- Critical severity. CVSS v3 base score is 9.9 out of 10.