CVE-2026-54761Public exploitNetwork attack vector

Internal service exposure via wrong namespace check

Published Jun 23, 2026 · Updated Jun 23, 2026

Incorrect authorization in Traefik Proxy before 3.6.21 and 3.7.0-ea.1 through 3.7.4 allows remote authenticated users to expose internal services. The Kubernetes Gateway WRR path replaces the HTTPRoute namespace with backendRef.namespace before checking crossProviderNamespaces. Exploitation requires an accepted multi-backend HTTPRoute and a matching ReferenceGrant; exposed services can include the API, dashboard, or REST handler.

CVSS severity6.0
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Traefik Proxy before 3.6.21 and 3.7.0-ea.1 through 3.7.4 allows remote authenticated users to expose internal services. The Kubernetes Gateway WRR path replaces the HTTPRoute namespace with backendRef.namespace before checking crossProviderNamespaces. Exploitation requires an accepted multi-backend HTTPRoute and a matching ReferenceGrant; exposed services can include the API, dashboard, or REST handler.

The record

CVE
CVE-2026-54761
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Traefik Labs
Product
Traefik Proxy
Classifications
CWE-863, CWE-284, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.6.21
  2. Affected versionversion=>= 3.7.0-ea.1, < 3.7.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Traefik Labs · Traefik Proxyversion=< 3.6.21; version=>= 3.7.0-ea.1, < 3.7.5

Published CVSS scores

7.1NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
6.0GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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