Authentication Bypass by Spoofing in Wekan - CVE-2026-55652
Published: July 28, 2026
Vulnerability identifier: #VU139853
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-55652
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wekan.github.io
Affected software:
Wekan
Wekan
Detailed vulnerability description
The vulnerability allows a remote attacker to take over arbitrary accounts, including administrative accounts.
The vulnerability exists due to improper access control in the header-login authentication mechanism when processing requests that supply a spoofed X-Forwarded-For header and a chosen header-login username. A remote attacker can send a specially crafted GET request to take over arbitrary accounts, including administrative accounts.
Exploitation requires the header-login feature to be enabled and the attacker to be able to reach the Wekan HTTP port directly without traversing the trusted reverse proxy.
How to mitigate CVE-2026-55652
Install security update from vendor's website.