Incorrect authorization in Traefik - CVE-2026-54765
Published: July 3, 2026
Vulnerability identifier: #VU136875
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-54765
CWE-ID: CWE-863
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 alter security-sensitive backend request context across routes and bypass authorization controls.
The vulnerability exists due to improper access control in pkg/provider/kubernetes/gateway/httproute.go when resolving accepted HTTPRoute backendRef filters for routes sharing the same backend Service:port. A remote user can create or modify an accepted HTTPRoute with different backendRef filters to alter security-sensitive backend request context across routes and bypass authorization controls.
Cross-namespace impact is possible when a ReferenceGrant permits targeting the shared backend.
How to mitigate CVE-2026-54765
Install security update from vendor's website.