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CVE-2026-35051— Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth

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开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在数据伪造问题漏洞，该漏洞源于ForwardAuth中间件在配置trustForwardHeader=false且部署在受信任上游代理后存在认证绕过漏洞。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.43 affected
>= 3.0.0-beta1, < 3.6.14 affected
>= 3.7.0-ea.1, < 3.7.0-rc.2 affected
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I. Basic Information for CVE-2026-35051

Vulnerability Information
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Vulnerability Title
Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
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:H/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 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在数据伪造问题漏洞，该漏洞源于ForwardAuth中间件在配置trustForwardHeader=false且部署在受信任上游代理后存在认证绕过漏洞。
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 < 2.11.43 -

II. Public POCs for CVE-2026-35051

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III. Intelligence Information for CVE-2026-35051

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Vendor Advisories for CVE-2026-35051 (1)

Vendor Pages for CVE-2026-35051 (3)

Same Patch Batch · traefik · 2026-04-30 · 5 CVEs total

CVE-2026-41263 Traefik: BasicAuth middleware: timing side-channel vulnerability
CVE-2026-41174 Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding
CVE-2026-39858 Traefik: Forwarded alias spoofing top pre-auth decision bypass
CVE-2026-40912 Traefik: StripPrefixRegex auth bypass via Path/RawPath desync

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-35051

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