CVE-2026-66780

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.9Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 20, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
Patch available. Sources: redhat.
redhat

2507524 – (CVE-2026-66780) CVE-2026-66780 submariner-operator: submariner-operator: flat broker trust model grants every spoke full CRUD on all endpoints, secrets, and endpointslices in broker namespace

https://bugzilla.redhat.com/show_bug.cgi?id=2507524
redhat Patch Available

CVE-2026-66780 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-66780

Vendor Advisories for CVE-2026-66780(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 05:36 UTCGHSA enrichment
  2. 2026-08-21 01:41 UTCEG score recompute
  3. 2026-08-21 01:41 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 21:46 UTCGHSA enrichment
  6. 2026-08-20 17:51 UTCGHSA enrichment
  7. 2026-08-20 13:56 UTCGHSA enrichment
  8. 2026-08-20 10:41 UTCGHSA enrichment
  9. 2026-08-20 06:47 UTCGHSA enrichment
  10. 2026-08-20 02:52 UTCGHSA enrichment
  11. 2026-08-19 22:57 UTCGHSA enrichment
  12. 2026-08-19 19:02 UTCEG score recompute
  13. 2026-08-19 19:02 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 15:07 UTCGHSA enrichment
  16. 2026-08-19 11:11 UTCGHSA enrichment
  17. 2026-08-19 07:14 UTCGHSA enrichment
  18. 2026-08-19 03:16 UTCGHSA enrichment
  19. 2026-08-18 23:19 UTCGHSA enrichment
  20. 2026-08-18 19:24 UTCEG score recompute
  21. 2026-08-18 19:24 UTCGHSA enrichment
  22. 2026-08-18 19:05 UTCEG score recompute
  23. 2026-08-18 19:05 UTCGHSA enrichment
  24. 2026-08-18 18:23 UTCEG score recompute
  25. 2026-08-18 17:40 UTCEG score recompute
Show 1 more
  1. 2026-08-18 17:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66780?
CVE-2026-66780 is a critical vulnerability published on August 18, 2026. 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.…
When was CVE-2026-66780 disclosed?
CVE-2026-66780 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66780 actively exploited?
CVE-2026-66780 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-66780?
CVE-2026-66780 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-66780?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66780, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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