Information disclosure in Red Hat Advanced Cluster Management For Kubernetes 2
CVE-2026-66780
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.006 · change: +0.003
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-66780 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:60386 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60389 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60390 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60387 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60388 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60391 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:63016 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:67538 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-66780?
- CVE-2026-66780 is a medium-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under Insertion of Sensitive Information into Log File. CVSS score: 6.5/10. Published 2026-08-18.
- How severe is CVE-2026-66780?
- Medium severity. CVSS v3 base score is 6.5 out of 10.