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CVE-2026-54764 is an origin-validation flaw in Traefik ForwardAuth middleware before versions 2.11.51, 3.6.22, and 3.7.6. When trustForwardHeader is disabled, ForwardAuth correctly sanitizes forwarded headers but derives the X-Forwarded-Port value supplied to the authentication service from the original inbound request rather than from the sanitized request state. An unauthenticated attacker can submit an X-Forwarded-Proto value indicating HTTPS over a plaintext HTTP connection, causing Traefik to report port 443 to the downstream authentication service.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication-bypass vulnerability in Traefik ForwardAuth middleware. Improper derivation of the X-Forwarded-Port header permits an unauthenticated remote attacker to spoof HTTPS/port 443 context through a plain HTTP request and bypass port-based authorization controls.
A Traefik ForwardAuth header sanitization flaw where X-Forwarded-Port is taken from the original request instead of a sanitized value, enabling spoofed trusted context.
A high-severity improper authorization vulnerability in Traefik ForwardAuth where attackers can inject X-Forwarded-Proto over HTTP to manipulate X-Forwarded-Port and bypass port-based authorization checks.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.