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CVE-2026-54764 is an improper authorization flaw in Traefik's ForwardAuth middleware. In affected versions prior to 2.11.51, 3.6.22, and 3.7.6, ForwardAuth derives the X-Forwarded-Port header sent to the external authentication service from the original incoming request rather than from the sanitized forwarded request, even when trustForwardHeader is set to false. This allows a remote unauthenticated attacker to send a plain HTTP request containing a forged X-Forwarded-Proto value indicating HTTPS, causing Traefik to present the authentication service with a misleading forwarded port value of 443. If the authentication service relies on forwarded port information as part of its authorization logic, the attacker can manipulate that decision path and bypass intended access controls.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.