Open redirect in Kanboard - CVE-2026-21879
Published: January 7, 2026 / Updated: January 9, 2026
Vulnerability identifier: #VU121015
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2026-21879
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Kanboard
Affected software:
Kanboard
Kanboard
Detailed vulnerability description
The vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to improper sanitization of user-supplied data within protocol-relative URLs. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
How to mitigate CVE-2026-21879
Install updates from vendor's website.