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Traefik EUVDEUVD-2026-41937

| CVE-2026-54764 MEDIUM
Insufficient Verification of Data Authenticity (CWE-345)
2026-07-06 GitHub_M
Authentication Bypass Traefik
6.9
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.9 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.8 MEDIUM

Network-reachable with no prerequisites; scope changes because the integrity impact lands on the downstream auth service, not Traefik itself.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 06, 2026 - 22:08 vuln.today
Patch available
Jul 06, 2026 - 22:02 EUVD

DescriptionCVE.org

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.

AnalysisAI

Header injection in Traefik's ForwardAuth middleware allows unauthenticated remote attackers to manipulate the X-Forwarded-Port value sent to authentication backends, enabling bypass of port-based authorization checks. Affected are all Traefik v2.x prior to v2.11.51, v3.6.x from 3.0.0 prior to v3.6.22, and v3.7.x from 3.7.0 prior to v3.7.6. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send HTTP request with injected X-Forwarded-Proto: https
Delivery
Traefik ForwardAuth reads original unsanitized header
Exploit
X-Forwarded-Port: 443 derived and forwarded to auth service
Execution
Auth service applies port-443 trust policy
Persist
Port-based authorization check bypassed
Impact
Attacker gains unauthorized access
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Vulnerability AssessmentAI

Exploitation The vulnerability requires that Traefik be configured with the ForwardAuth middleware - deployments not using ForwardAuth are entirely unaffected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 with vector AV:N/AC:L/AT:N/PR:N/UI:N reflects that the attack is network-accessible, requires no privileges, no user interaction, and no special attack prerequisites - making it trivially reachable. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a plain HTTP request to a publicly reachable Traefik instance with the header X-Forwarded-Proto: https appended. Traefik's ForwardAuth middleware, despite trustForwardHeader: false, derives X-Forwarded-Port: 443 from this attacker-controlled value and forwards it to the configured authentication service. …
Remediation Upgrade to Traefik v2.11.51, v3.6.22, or v3.7.6 depending on your deployment branch; these are the vendor-confirmed fixed releases per GHSA-3q9r-p662-5j8m. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-41937 vulnerability details – vuln.today
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