CVE-2026-52891CWE-78CWE-88

Wekan: Shell Injection via Avatar Upload

Critical · published July 15, 2026

CVSS v3.1
9.9
EPSS
1%
Percentile
55.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00785 · 55.6th percentile
Weaknesses
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'); CWE-88 · Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Published
2026-07-15T21:08Z
EPSS history
Timeline
  • 15 JUL 21:08Z
    Wekan: Shell Injection via Avatar Upload
    cvelistv5