๐Ÿ›ก๏ธ CVE-2026-21881
๐Ÿ”ด CVSS 9.1 โ€” Critical โš ๏ธ Exploit Public CWE-287 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity CRITICAL
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-287
Public Exploit โš ๏ธ Yes
Source NVD
Published 2026-01-08
Updated 2026-06-02
Modified 2026-01-20

Affected Packages

Software From version Fixed in
kanboard โ€” 1.2.49

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