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%CVSS: 7.1Exploit: None knownExposed: 0

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
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 8, 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 / EcosystemFixed in / 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 37× in last 7d / 171× 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 206 total refreshes for this CVE.

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

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 in the National Vulnerability Database on August 13, 2026, with the most recent update on September 8, 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% probability of exploitation in the next 30 days, which ranks it in the top 87.8% of all scored CVEs.
What is the CVSS score of CVE-2026-73266?
CVE-2026-73266 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-73266?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73266, 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.

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