Categories
CVE-2026-21881

Kanboard is Vulnerable to Reverse Proxy Authentication Bypass

Summary

Kanboard is Vulnerable to Reverse Proxy Authentication Bypass

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

References

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