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CVE-2026-21881

Kanboard is Vulnerable to Reverse Proxy Authentication Bypass PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
kanboard / kanboardaffected < 1.2.49

CWE

CWE-287

References

ADP enrichment

CISA-ADP

No English description supplied.