kanboard: Kanboard is project management software focused on Kanban methodology
CVE-2026-21881 is fixed in kanboard on 1 platform by DEBIAN-CVE-2026-21881 (version 1.2.49+ds-1), released January 8, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| kanboard · Debian 14 | 1.2.49+ds-1 | DEBIAN-CVE-2026-21881 | Jan 8, 2026 |
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