Wekan: Shell Injection via Avatar Upload

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.

Scores

EPSS (exploitation in 30 days)

0.78% · top 44% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.9.

Weakness

• CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (opens in a new tab)All about CWE-78 and its CVEs
• CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (opens in a new tab)All about CWE-88 and its CVEs

Affected products

• wekan · wekan

  • affected < 9.07

References (3)

• https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g (opens in a new tab)x_refsource_CONFIRM
• https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9 (opens in a new tab)x_refsource_MISC
• https://github.com/wekan/wekan/releases/tag/v9.07 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-52891](https://trackcve.app/badge/CVE-2026-52891.svg)](https://trackcve.app/cve/CVE-2026-52891)

Record last updated 17 Jul 2026, 18:23 UTC.