#VU121017 Improper Authentication in Kanboard - CVE-2026-21881

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Main Vulnerability Database Vulnerabilities #VU121017

#VU121017 Improper Authentication in Kanboard - CVE-2026-21881

Published: January 7, 2026 / Updated: January 9, 2026


Vulnerability identifier: #VU121017
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2026-21881
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability: Public exploit is available
Vulnerable software:
Kanboard
Software vendor:
Kanboard

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when REVERSE_PROXY_AUTH is enabled. A remote attacker can bypass authentication process and gain unauthorized access to the application.


Remediation

Install updates from vendor's website.

External links