Critical severity · published Jul 15, 2026
CVE-2026-52891
Wekan: Shell Injection via Avatar Upload
9.9
CVSS
0.8%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
wekan · wekan
< 9.07 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-52891
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-52891
github.com
https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9
github.com
https://github.com/wekan/wekan/releases/tag/v9.07
github.com
https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g
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