Improper access control in Traefik - CVE-2026-44774
Published: May 12, 2026
Vulnerability identifier: #VU131172
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-44774
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Containous
Affected software:
Traefik
Traefik
Detailed vulnerability description
The vulnerability allows a remote user to gain unauthorized dynamic-configuration write access to Traefik.
The vulnerability exists due to improper access control in the Kubernetes Gateway API provider TraefikService backend handling when processing tenant-controlled HTTPRoute backend references. A remote user can create or update an HTTPRoute that targets rest@internal to gain unauthorized dynamic-configuration write access to Traefik.
Exploitation requires the Kubernetes Gateway API provider and the REST provider to be enabled, with a shared Gateway that permits HTTPRoute attachment from an allowed tenant namespace.
How to mitigate CVE-2026-44774
Install security update from vendor's website.