Input validation error in Wekan - #VU147311
Published: September 7, 2026
Vulnerability identifier: #VU147311
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose ordinary request metadata.
The vulnerability exists due to improper input validation in the XLSX attachment preview when rendering an uploaded XLSX file with a crafted sheet tab color. A remote user can upload a specially crafted XLSX attachment to inject CSS declarations into a sheet-tab button.
An authorized board member must open the attachment preview.
Affected software
Wekan
Remediation
Install security update from vendor's website.
Wekan - update to 11.52