by Kastro
Paper/Archive/CVE-2026-52891

CVE-2026-52891

wekan wekan — Wekan: Shell Injection via Avatar Upload

EPSS 0.8%CVSS 9.9
critical.is priorityof 100
41
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 56.1.561 × 2011.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
wekan< 9.07–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9grefgithub.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9refgithub.com/wekan/wekan/releases/tag/v9.07