CVE-2026-73266

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH 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 — 3 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

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

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(high)
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
6%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 18, 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(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 32× in last 7d / 37× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 20:10 UTCGHSA enrichment
  3. 2026-08-20 07:18 UTCGHSA enrichment
  4. 2026-08-19 18:27 UTCEG score recompute
  5. 2026-08-19 18:27 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 04:06 UTCGHSA enrichment
  8. 2026-08-18 15:12 UTCEG score recompute
  9. 2026-08-18 15:12 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 02:21 UTCEG score recompute
  13. 2026-08-18 02:21 UTCGHSA enrichment
  14. 2026-08-18 01:47 UTCEG score recompute
  15. 2026-08-18 01:47 UTCGHSA enrichment
  16. 2026-08-18 00:31 UTCEG score recompute
  17. 2026-08-18 00:31 UTCGHSA enrichment
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 11:35 UTCGHSA enrichment
  20. 2026-08-16 22:44 UTCEG score recompute
  21. 2026-08-16 22:44 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 09:52 UTCEG score recompute
  25. 2026-08-16 09:52 UTCGHSA enrichment
Show 12 more
  1. 2026-08-16 02:15 UTCEPSS rescore
  2. 2026-08-15 21:01 UTCGHSA enrichment
  3. 2026-08-15 08:09 UTCEG score recompute
  4. 2026-08-15 08:09 UTCGHSA enrichment
  5. 2026-08-15 01:31 UTCEPSS rescore
  6. 2026-08-14 19:17 UTCGHSA enrichment
  7. 2026-08-14 19:01 UTCGHSA enrichment
  8. 2026-08-14 06:10 UTCEG score recompute
  9. 2026-08-14 06:10 UTCGHSA enrichment
  10. 2026-08-13 17:18 UTCEG score recompute
  11. 2026-08-13 17:02 UTCEG score recompute
  12. 2026-08-13 17:01 UTCMITRE cvelistV5first tracked

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 August 18, 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 94.3% 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.

Dependency Blast Radius

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