SB2026090798 - Input validation error in Wekan
Published: September 7, 2026
Security Bulletin ID
SB2026090798
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: N/A)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.