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.

INFO

Published Date :

2026-01-08T01:08:01.853Z

Last Modified :

2026-01-08T17:13:05.216Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21881 vulnerability.

Vendors Products
Kanboard
  • Kanboard
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21881.

URL Resource
https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fc cve-icon cve-icon
https://github.com/kanboard/kanboard/releases/tag/v1.2.49 cve-icon cve-icon
https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w cve-icon cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact