---
id: CVE-2026-52891
title: Wekan is open source kanban built with Meteor
summary: >-
  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/…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-78
  - CWE-88
published: '2026-07-15'
updated: '2026-07-17'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52891'
references:
  - url: >-
      https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9
    label: security-advisories@github.com
  - url: 'https://github.com/wekan/wekan/releases/tag/v9.07'
    label: security-advisories@github.com
  - url: 'https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00785
epssPercentile: 0.5458
ingestedAt: '2026-07-18T18:24:14.331Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.