Vulnerability · Published Oct 30, 2026 · Assigned by VulnCheck

CVE-2026-119573Traefik 3.7.11 before 3.7.15 Cross-Namespace Authorization Bypass via auth-tls-secret

Medium 4.4

In plain English

A medium-severity incorrect authorization in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)4.4Medium

Exploit odds (30 days)0.3%top 82.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Traefik 3.7.11 before 3.7.15 contains an authorization bypass in the Kubernetes Ingress NGINX provider that skips the cross-namespace check on the auth-tls-secret annotation when a cached client authentication TLS option is reused. Users who can create Ingresses can reference another namespace's CA secret already used by another Ingress, enforcing it on their own routes and learning whether it exists, without disclosure of its contents.

Affected products (as reported)

Vendor	Product	Versions
traefik	traefik	3.7.11 – before 3.7.15

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-28hp-c82p-8vqj) vendor-advisory
VulnCheck Advisory: Traefik 3.7.11 before 3.7.15 Cross-Namespace Authorization Bypass via auth-tls-secret third-party-advisory