Advisory severityMedium5.8Red Hat Linux

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.

CVE-2026-54764 Source published Jul 6, 2026Source updated Jul 6, 2026

VulniPulse record published Jul 25, 2026Record updated Jul 27, 2026

CVE-2026-54764

Affected products & platforms

Red Hat LinuxUnclassified

Open source advisory

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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.

Affected versions

< 11.51
< 6.22
< 7.6

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Fixed versions

11.51
6.22

Official advisory · high-confidence parse· fetched 15 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 additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Discussion(0)

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