CVE-2026-66780

CRITICALPre-NVD 6.59.9▲
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. A secondary CVSS source baseline 6.5; sources differ by 3.4.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.5
EG Score
9.9CRITICALmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

September 29, 2026

Advisory Details (8)

Auto-updated Sep 1, 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
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60390
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60386
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60391
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60389
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60388
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60387

Vendor Advisories for CVE-2026-66780(9)

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

Patch Availability(14)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhacm2/submariner-addon-rhel9:17878544162026-09-28redhat
redhatrhacm2/submariner-addon-rhel9:17891363282026-09-15redhat
redhatrhacm2/submariner-addon-rhel9:17891363272026-09-15redhat
redhatrhacm2/submariner-addon-rhel9:17891363202026-09-15redhat
redhatrhacm2/submariner-addon-rhel9:17891313972026-09-15redhat
redhatrhacm2/submariner-addon-rhel9:17891356062026-09-15redhat
redhatrhacm2/submariner-addon-rhel9:17885725272026-09-15redhat
redhatrhacm2/submariner-rhel9-operator:17880734812026-09-03redhat
redhatrhacm2/submariner-addon-rhel9:17873626582026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17876890132026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873627562026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873659712026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873627332026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873626942026-08-26redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 65× in last 7d / 338× 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.

Showing the most recent 100 of 544 total refreshes for this CVE.

  1. 2026-10-05 06:05 UTCVendor advisory
  2. 2026-10-05 06:05 UTCGHSA enrichment
  3. 2026-10-05 01:55 UTCEG score recompute
  4. 2026-10-05 01:55 UTCVendor advisory
  5. 2026-10-05 01:55 UTCGHSA enrichment
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-04 21:42 UTCVendor advisory
  8. 2026-10-04 21:42 UTCGHSA enrichment
  9. 2026-10-04 16:16 UTCVendor advisory
  10. 2026-10-04 16:16 UTCGHSA enrichment
  11. 2026-10-04 11:42 UTCVendor advisory
  12. 2026-10-04 11:41 UTCGHSA enrichment
  13. 2026-10-04 07:04 UTCVendor advisory
  14. 2026-10-04 07:04 UTCGHSA enrichment
  15. 2026-10-04 03:10 UTCVendor advisory
  16. 2026-10-04 03:10 UTCGHSA enrichment
  17. 2026-10-03 21:33 UTCVendor advisory
  18. 2026-10-03 21:33 UTCGHSA enrichment
  19. 2026-10-03 17:38 UTCEG score recompute
  20. 2026-10-03 17:38 UTCVendor advisory
  21. 2026-10-03 17:38 UTCGHSA enrichment
  22. 2026-10-03 14:26 UTCEPSS rescore
  23. 2026-10-03 00:44 UTCVendor advisory
  24. 2026-10-03 00:44 UTCGHSA enrichment
  25. 2026-10-02 19:06 UTCEG score recompute
Show 75 more
  1. 2026-10-02 19:06 UTCVendor advisory
  2. 2026-10-02 19:06 UTCGHSA enrichment
  3. 2026-10-02 17:56 UTCEPSS rescore
  4. 2026-10-02 15:07 UTCVendor advisory
  5. 2026-10-02 15:07 UTCGHSA enrichment
  6. 2026-10-02 06:53 UTCVendor advisory
  7. 2026-10-02 06:53 UTCGHSA enrichment
  8. 2026-10-02 01:28 UTCEG score recompute
  9. 2026-10-02 01:28 UTCVendor advisory
  10. 2026-10-02 01:27 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 13:38 UTCVendor advisory
  13. 2026-10-01 13:38 UTCGHSA enrichment
  14. 2026-10-01 09:42 UTCVendor advisory
  15. 2026-10-01 09:42 UTCGHSA enrichment
  16. 2026-10-01 05:47 UTCVendor advisory
  17. 2026-10-01 05:47 UTCGHSA enrichment
  18. 2026-10-01 01:28 UTCVendor advisory
  19. 2026-10-01 01:28 UTCGHSA enrichment
  20. 2026-09-30 20:50 UTCEG score recompute
  21. 2026-09-30 20:50 UTCVendor advisory
  22. 2026-09-30 20:50 UTCGHSA enrichment
  23. 2026-09-30 15:03 UTCEPSS rescore
  24. 2026-09-30 09:48 UTCEG score recompute
  25. 2026-09-30 09:48 UTCVendor advisory
  26. 2026-09-30 09:48 UTCGHSA enrichment
  27. 2026-09-29 05:16 UTCVendor advisory
  28. 2026-09-29 05:15 UTCGHSA enrichment
  29. 2026-09-29 01:20 UTCEG score recompute
  30. 2026-09-29 01:20 UTCVendor advisory
  31. 2026-09-29 01:20 UTCGHSA enrichment
  32. 2026-09-29 00:56 UTCEG score recompute
  33. 2026-09-29 00:56 UTCVendor advisory
  34. 2026-09-29 00:56 UTCGHSA enrichment
  35. 2026-09-28 21:56 UTCEG score recompute
  36. 2026-09-28 21:56 UTCVendor advisory
  37. 2026-09-28 21:56 UTCGHSA enrichment
  38. 2026-09-28 13:52 UTCEPSS rescore
  39. 2026-09-28 12:55 UTCVendor advisory
  40. 2026-09-28 12:55 UTCGHSA enrichment
  41. 2026-09-28 09:00 UTCVendor advisory
  42. 2026-09-28 09:00 UTCGHSA enrichment
  43. 2026-09-28 05:05 UTCVendor advisory
  44. 2026-09-28 05:05 UTCGHSA enrichment
  45. 2026-09-28 01:10 UTCVendor advisory
  46. 2026-09-28 01:10 UTCGHSA enrichment
  47. 2026-09-27 21:15 UTCVendor advisory
  48. 2026-09-27 21:15 UTCGHSA enrichment
  49. 2026-09-27 16:18 UTCEG score recompute
  50. 2026-09-27 16:18 UTCVendor advisory
  51. 2026-09-27 16:18 UTCGHSA enrichment
  52. 2026-09-27 13:48 UTCEPSS rescore
  53. 2026-09-27 12:19 UTCVendor advisory
  54. 2026-09-27 12:19 UTCGHSA enrichment
  55. 2026-09-27 07:55 UTCEG score recompute
  56. 2026-09-27 07:55 UTCVendor advisory
  57. 2026-09-27 07:55 UTCGHSA enrichment
  58. 2026-09-26 15:59 UTCEPSS rescore
  59. 2026-09-25 09:19 UTCVendor advisory
  60. 2026-09-25 09:19 UTCGHSA enrichment
  61. 2026-09-25 05:24 UTCVendor advisory
  62. 2026-09-25 05:24 UTCGHSA enrichment
  63. 2026-09-25 01:26 UTCVendor advisory
  64. 2026-09-25 01:26 UTCGHSA enrichment
  65. 2026-09-24 16:05 UTCEG score recompute
  66. 2026-09-24 16:05 UTCVendor advisory
  67. 2026-09-24 16:05 UTCGHSA enrichment
  68. 2026-09-24 12:00 UTCVendor advisory
  69. 2026-09-24 12:00 UTCGHSA enrichment
  70. 2026-09-24 08:05 UTCVendor advisory
  71. 2026-09-24 08:05 UTCGHSA enrichment
  72. 2026-09-24 04:10 UTCVendor advisory
  73. 2026-09-24 04:10 UTCGHSA enrichment
  74. 2026-09-24 00:15 UTCVendor advisory
  75. 2026-09-24 00:15 UTCGHSA enrichment

Related CVEs(same vendor + 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 on August 18, 2026, with the most recent update on September 29, 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 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66780?
CVE-2026-66780 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.9 (CRITICAL).
How do I remediate CVE-2026-66780?
A fix for CVE-2026-66780 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66780 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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