Original description
Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend.
Affected software
- Traefik < 3.7.11≥ 3.7.1 ≤ 3.7.12 Fixed in: 3.7.11 exact match
Details
- Published
- 2026-09-04
- Last modified
- 2026-10-09
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N- CWE
- CWE-639
References
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