CVE-2026-66793

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
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

A fix is available — apply it.

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(medium)
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
54%
KEV
Not listed

Published

August 18, 2026

Last Modified

September 5, 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(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
redhatrhacm2/acm-governance-policy-addon-controller-rhel9:17872385352026-08-26redhat
redhatrhacm2/acm-governance-policy-addon-controller-rhel9:17872590782026-08-26redhat
redhatrhacm2/acm-governance-policy-addon-controller-rhel9:17870807532026-08-26redhat
redhatrhacm2/acm-governance-policy-addon-controller-rhel9:17876833272026-08-26redhat
redhatrhacm2/acm-governance-policy-addon-controller-rhel9:17870807552026-08-26redhat
redhatrhacm2/acm-governance-policy-addon-controller-rhel9:17872276962026-08-26redhat

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(1)

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

Data Freshness Timeline

(refreshed 40× in last 7d / 170× 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 182 total refreshes for this CVE.

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

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 September 5, 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 46.4% of all scored CVEs.
What is the CVSS score of CVE-2026-66793?
CVE-2026-66793 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
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

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