CVE-2026-73266

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 13, 2026

Last Modified

September 29, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
Patch available. Sources: redhat.
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2514217
redhat Patch Available

CVE-2026-73266 - 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-2026-73266

Vendor Advisories for CVE-2026-73266(7)

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

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatmulticluster-engine/clusterclaims-controller-rhel9:17871960142026-08-25redhat
redhatmulticluster-engine/clusterclaims-controller-rhel9:17872591122026-08-25redhat
redhatmulticluster-engine/clusterclaims-controller-rhel9:17872590592026-08-25redhat
redhatmulticluster-engine/clusterclaims-controller-rhel9:17871959952026-08-25redhat
redhatmulticluster-engine/clusterclaims-controller-rhel9:17872394422026-08-25redhat
redhatmulticluster-engine/clusterclaims-controller-rhel9:17865779502026-08-25redhat

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(1)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 158× 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 277 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-73266?
CVE-2026-73266 is a high vulnerability published on August 13, 2026. A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized…
When was CVE-2026-73266 disclosed?
CVE-2026-73266 was first published on August 13, 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-2026-73266 actively exploited?
CVE-2026-73266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73266?
CVE-2026-73266 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73266?
A fix for CVE-2026-73266 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73266 are linked in the Vendor Advisories panel on this page.

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