CVE-2026-71325Public exploitHinoki check available

Cross-namespace backend exposure via unchecked service references

Published Aug 6, 2026 · Updated Aug 6, 2026

Incorrect authorization in Traefik Proxy's Kubernetes CRD provider allows local users to expose cross-namespace backends through crafted references. The configBuilder.nameAndService resolver skips isNamespaceAllowed for names containing @ and fails to consult allowCrossNamespace before accepting @kubernetescrd TraefikService backend references. Namespace-scoped RBAC to create a router and knowledge of a target TraefikService name are sufficient to expose or reroute that backend under an attacker-controlled route.

CVSS severity4.8
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect authorization in Traefik Proxy's Kubernetes CRD provider allows local users to expose cross-namespace backends through crafted references. The configBuilder.nameAndService resolver skips isNamespaceAllowed for names containing @ and fails to consult allowCrossNamespace before accepting @kubernetescrd TraefikService backend references. Namespace-scoped RBAC to create a router and knowledge of a target TraefikService name are sufficient to expose or reroute that backend under an attacker-controlled route.

The record

CVE
CVE-2026-71325
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Traefik Labs
Product
Traefik Proxy
Classifications
CWE-653, CWE-863
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=< 2.11.54
  2. Affected versionversion=>= 3.0.0, < 3.6.25
  3. Affected versionversion=>= 3.7.0, < 3.7.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Traefik Labs · Traefik Proxyversion=< 2.11.54; version=>= 3.0.0, < 3.6.25; version=>= 3.7.0, < 3.7.10

Published CVSS scores

4.8GitHubCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-653Improper Isolation or Compartmentalization
CWE-863Incorrect Authorization

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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