Description
A flaw was found in the submariner-operator component. The `submariner-k8s-broker-cluster` Role, which is assigned to joined clusters, possesses excessive permissions. This allows a compromised cluster to alter network configurations, specifically by overwriting other clusters' endpoint information. Consequently, an attacker can redirect inter-cluster tunnel traffic, enabling a Man-in-the-Middle (MITM) attack across the entire cluster mesh.
References10
- access.redhat.com/errata/RHSA-2026:63016
- access.redhat.com/errata/RHSA-2026:67538
- access.redhat.com/errata/RHSA-2026:67539
- access.redhat.com/errata/RHSA-2026:67540
- access.redhat.com/errata/RHSA-2026:67541
- access.redhat.com/errata/RHSA-2026:67542
- access.redhat.com/errata/RHSA-2026:67543
- access.redhat.com/errata/RHSA-2026:72880
- access.redhat.com/errata/RHSA-2026:85227
- access.redhat.com/security/cve/CVE-2026-66780
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 48 · as of 11 November 2026
- CWE
- CWE-532
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.