Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-52891Wekan: Shell Injection via Avatar Upload

Critical 9.9

In plain English

A critical-severity OS command injection in wekan from wekan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.8%top 43.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
wekan	wekan	< 9.07

Weakness: CWE-78, CWE-88 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

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