CVE-2026-21881 – Kanboard is Vulnerable to Reverse Proxy Authentication Bypass

CVE ID : CVE-2026-21881

Published : Jan. 8, 2026, 1:08 a.m. | 1 hour, 20 minutes ago

Description : Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.

Severity: 0.0 | NA

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