Medium [CVE-2026-54764] Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
This medium-severity Red Hat Linux advisory covers CVE-2026-54764 affecting Red Hat OpenShift Dev Spaces.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request.
As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
This bypasses port-based authorization checks, potentially granting unauthorized access. Moderate: A flaw in Traefik's ForwardAuth middleware, as used in Red Hat OpenShift Dev Spaces, allows an unauthenticated remote attacker to bypass port-based authorization.
Red Hat severity: Moderate — CVSS 5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N). Weakness: CWE-348.
Affected Red Hat products: Red Hat OpenShift Dev Spaces. Red Hat does not currently list a fixing RHSA for this CVE.
Is CVE-2026-54764 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54764 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-54764?
Upgrade to a fixed release named by Red Hat:
- 11.51
- 6.22
Confirm against the vendor advisory before you patch.
- < 11.51
- < 6.22
- < 7.6
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- 11.51
- 6.22
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation
Upgrade to a fixed release: 11.51, 6.22. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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