cvedb.io
CVE-2026-21881
CRITICAL · CVSS 9.1
EPSS exploitation probability: 0%
Published 2026-01-08T02:15:53.803 · Last modified 2026-06-17T10:19:04.960

Summary

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.

Affected products

kanboard — kanboard

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.