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Vulnerability record · CVE-2026-52891 · published 15 July 2026

CVE-2026-52891: OS command injection vulnerability

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 3.1 Critical EPSS 0.78% · top 45.7% CWE-78 · OS command injectionCWE-88 · Argument injection Deferred
9.9CVSS 3.1 base score
0.78%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jul 2026Last modified by NVD

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

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-52891), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.