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CVE-2026-54764— ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik 2.11.51之前版本、3.6.22之前版本和3.7.6之前版本存在输入验证错误漏洞，该漏洞源于ForwardAuth middleware从原始请求而不是清理后的转发请求中获取X-Forwarded-Port标头，导致未经身份验证的远程攻击者可以通过纯HTTP连接注入X-Forwarded-Proto: https标头，使Traefik向认证服务转发X-Forwarded-Port: 443，绕过基于端口的授权检查。

AI Predicted 7.5 Difficulty: Easy EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.51 affected
>= 3.0.0, < 3.6.22 affected
>= 3.7.0, < 3.7.6 affected
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I. Basic Information for CVE-2026-54764

Vulnerability Information
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Vulnerability Title
ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik 2.11.51之前版本、3.6.22之前版本和3.7.6之前版本存在输入验证错误漏洞，该漏洞源于ForwardAuth middleware从原始请求而不是清理后的转发请求中获取X-Forwarded-Port标头，导致未经身份验证的远程攻击者可以通过纯HTTP连接注入X-Forwarded-Proto: https标头，使Traefik向认证服务转发X-Forwarded-Port: 443，绕过基于端口的授权检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik < 2.11.51 -

II. Public POCs for CVE-2026-54764

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III. Intelligence Information for CVE-2026-54764

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Patches & Fixes for CVE-2026-54764 (2)

Vendor Advisories for CVE-2026-54764 (1)

Same Patch Batch · traefik · 2026-07-06 · 3 CVEs total

CVE-2026-54763 Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / Forw
CVE-2026-54765 Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes shari

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-345

V. Comments for CVE-2026-54764

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