CVE-2026-21881
CRITICAL SEVERITYCVSS Score & Metrics
Base Score
9.1 / 10
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Vulnerability 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.
Vulnerability Details
Published Date
Last Modified
CWE ID
CWE-287
Source
NVD
Vendor
kanboard
Product
kanboard
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