SB2026051269 - Improper access control in Traefik

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Main Vulnerability Database SB2026051269

SB2026051269 - Improper access control in Traefik

Published: May 12, 2026

Security Bulletin ID SB2026051269
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-44774)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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


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.


Remediation

Install update from vendor's website.

References