CVE-2026-66793

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: 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 governance-policy-addon-controller component of Red Hat Advanced Cluster Management for Kubernetes. A user with permissions to annotate the namespaced ManagedClusterAddOn resource can override the governance-policy container image. This allows an attacker to run a controlled image with cluster-admin privileges on the managed cluster, leading to arbitrary code execution and privilege escalation.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 20, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
Patch available. Sources: redhat.
redhat

2507538 – (CVE-2026-66793) CVE-2026-66793 governance-policy-addon-controller: governance-policy-addon-controller: arbitrary container image override via ManagedClusterAddOn annotation enables RCE on spoke

https://bugzilla.redhat.com/show_bug.cgi?id=2507538
redhat Patch Available

CVE-2026-66793 - 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-2026-66793

Vendor Advisories for CVE-2026-66793(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 16× in last 7d / 16× 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 00:55 UTCEG score recompute
  2. 2026-08-21 00:55 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 13:57 UTCGHSA enrichment
  5. 2026-08-20 03:22 UTCEG score recompute
  6. 2026-08-20 03:22 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 16:22 UTCGHSA enrichment
  9. 2026-08-19 05:24 UTCGHSA enrichment
  10. 2026-08-18 18:24 UTCEG score recompute
  11. 2026-08-18 18:24 UTCGHSA enrichment
  12. 2026-08-18 18:15 UTCEG score recompute
  13. 2026-08-18 18:15 UTCGHSA enrichment
  14. 2026-08-18 15:19 UTCEG score recompute
  15. 2026-08-18 15:14 UTCEG score recompute
  16. 2026-08-18 15:14 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66793?
CVE-2026-66793 is a high vulnerability published on August 18, 2026. A flaw was found in the governance-policy-addon-controller component of Red Hat Advanced Cluster Management for Kubernetes. A user with permissions to annotate the namespaced ManagedClusterAddOn resource can override the governance-policy container image. This allows an attacker to run a controlled…
When was CVE-2026-66793 disclosed?
CVE-2026-66793 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-2026-66793 actively exploited?
CVE-2026-66793 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.1% of all scored CVEs.
What is the CVSS score of CVE-2026-66793?
CVE-2026-66793 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-66793?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66793, 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

Explore the affected products and dependency analysis for CVE-2026-66793

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