CVE-2026-10090

CRITICALPre-NVD 9.09.9▲
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-05. a secondary CVSS source baseline 9.0; sources differ by 0.9.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.0Exploit: 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 Application Subscription controller (multicluster-operators-subscription) of Red Hat Advanced Cluster Management for Kubernetes (ACM). A user with namespace-scoped "edit" privileges in an ACM hub namespace can create a Channel resource pointing to a Helm repository they control and a Subscription resource referencing it. The app-subscription controller fetches and applies the Helm chart contents with its own elevated authority, without verifying whether the subscription creator holds the "open-cluster-management:subscription-admin" role and without restricting applied resources to the subscription namespace. This allows the attacker to include cluster-scoped resources in the Helm chart, such as a ClusterRoleBinding granting the attacker's ServiceAccount the "cluster-admin" ClusterRole. Successful exploitation results in full cluster-admin privilege escalation. This contradicts the ACM documentation which states that non-subscription-admin users should have resources deployed into the subscription namespace only.

CVSS v3
9.0
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
Patch available. Sources: redhat.
redhat

2483292 – (CVE-2026-10090) CVE-2026-10090 multicluster-operators-subscription: multicluster-operators-subscription: namespace edit user can deploy cluster-scoped ClusterRoleBinding and become cluster-admin via Application Subscription

https://bugzilla.redhat.com/show_bug.cgi?id=2483292
redhat Patch Available

CVE-2026-10090 - 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-2026-10090

Vendor Advisories for CVE-2026-10090(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 56× in last 7d / 144× 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 144 total refreshes for this CVE.

  1. 2026-08-21 05:36 UTCGHSA enrichment
  2. 2026-08-21 01:49 UTCEG score recompute
  3. 2026-08-21 01:49 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 21:56 UTCGHSA enrichment
  6. 2026-08-20 18:09 UTCGHSA enrichment
  7. 2026-08-20 14:20 UTCGHSA enrichment
  8. 2026-08-20 10:05 UTCGHSA enrichment
  9. 2026-08-20 06:18 UTCGHSA enrichment
  10. 2026-08-20 02:27 UTCGHSA enrichment
  11. 2026-08-19 22:40 UTCGHSA enrichment
  12. 2026-08-19 18:53 UTCEG score recompute
  13. 2026-08-19 18:53 UTCGHSA enrichment
  14. 2026-08-19 17:03 UTCEPSS rescore
  15. 2026-08-19 14:39 UTCGHSA enrichment
  16. 2026-08-19 10:50 UTCGHSA enrichment
  17. 2026-08-19 07:03 UTCGHSA enrichment
  18. 2026-08-19 03:15 UTCGHSA enrichment
  19. 2026-08-18 23:19 UTCGHSA enrichment
  20. 2026-08-18 19:33 UTCGHSA enrichment
  21. 2026-08-18 15:46 UTCEG score recompute
  22. 2026-08-18 15:46 UTCGHSA enrichment
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-18 10:59 UTCGHSA enrichment
  25. 2026-08-18 07:11 UTCGHSA enrichment
Show 75 more
  1. 2026-08-18 03:20 UTCGHSA enrichment
  2. 2026-08-17 23:24 UTCGHSA enrichment
  3. 2026-08-17 19:37 UTCGHSA enrichment
  4. 2026-08-17 15:50 UTCEG score recompute
  5. 2026-08-17 15:50 UTCGHSA enrichment
  6. 2026-08-17 12:02 UTCGHSA enrichment
  7. 2026-08-17 08:14 UTCGHSA enrichment
  8. 2026-08-17 04:28 UTCGHSA enrichment
  9. 2026-08-17 00:41 UTCGHSA enrichment
  10. 2026-08-16 20:54 UTCGHSA enrichment
  11. 2026-08-16 17:07 UTCEG score recompute
  12. 2026-08-16 17:07 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 13:20 UTCGHSA enrichment
  15. 2026-08-16 09:33 UTCGHSA enrichment
  16. 2026-08-16 05:46 UTCEG score recompute
  17. 2026-08-16 05:46 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-16 02:00 UTCGHSA enrichment
  20. 2026-08-15 22:13 UTCGHSA enrichment
  21. 2026-08-15 18:26 UTCGHSA enrichment
  22. 2026-08-15 14:39 UTCGHSA enrichment
  23. 2026-08-15 10:52 UTCGHSA enrichment
  24. 2026-08-15 07:05 UTCGHSA enrichment
  25. 2026-08-15 03:18 UTCEG score recompute
  26. 2026-08-15 03:18 UTCGHSA enrichment
  27. 2026-08-15 01:30 UTCEPSS rescore
  28. 2026-08-14 23:31 UTCGHSA enrichment
  29. 2026-08-14 19:44 UTCGHSA enrichment
  30. 2026-08-14 15:58 UTCGHSA enrichment
  31. 2026-08-14 12:11 UTCGHSA enrichment
  32. 2026-08-14 08:24 UTCGHSA enrichment
  33. 2026-08-14 04:38 UTCGHSA enrichment
  34. 2026-08-14 00:51 UTCEG score recompute
  35. 2026-08-14 00:51 UTCGHSA enrichment
  36. 2026-08-13 22:00 UTCEPSS rescore
  37. 2026-08-13 21:04 UTCGHSA enrichment
  38. 2026-08-13 17:15 UTCGHSA enrichment
  39. 2026-08-13 13:28 UTCGHSA enrichment
  40. 2026-08-13 09:41 UTCGHSA enrichment
  41. 2026-08-13 05:55 UTCGHSA enrichment
  42. 2026-08-13 02:08 UTCGHSA enrichment
  43. 2026-08-12 22:21 UTCEG score recompute
  44. 2026-08-12 22:21 UTCGHSA enrichment
  45. 2026-08-12 22:01 UTCGHSA enrichment
  46. 2026-08-12 21:22 UTCEG score recompute
  47. 2026-08-12 21:22 UTCGHSA enrichment
  48. 2026-08-12 21:20 UTCMITRE cvelistV5CVSS v3 → 9
  49. 2026-08-12 20:22 UTCGHSA enrichment
  50. 2026-08-12 16:36 UTCEG score recompute
  51. 2026-08-12 16:36 UTCGHSA enrichment
  52. 2026-08-12 15:35 UTCMITRE cvelistV5CVSS v3 → 9.1
  53. 2026-08-12 15:33 UTCEG score recompute
  54. 2026-08-12 15:33 UTCGHSA enrichment
  55. 2026-08-12 13:50 UTCEPSS rescore
  56. 2026-08-12 11:46 UTCGHSA enrichment
  57. 2026-08-12 07:58 UTCGHSA enrichment
  58. 2026-08-12 04:11 UTCGHSA enrichment
  59. 2026-08-12 00:23 UTCGHSA enrichment
  60. 2026-08-11 20:37 UTCGHSA enrichment
  61. 2026-08-11 16:50 UTCEG score recompute
  62. 2026-08-11 16:50 UTCGHSA enrichment
  63. 2026-08-11 13:42 UTCEPSS rescore
  64. 2026-08-11 13:03 UTCGHSA enrichment
  65. 2026-08-11 09:16 UTCGHSA enrichment
  66. 2026-08-11 05:29 UTCGHSA enrichment
  67. 2026-08-11 01:43 UTCEG score recompute
  68. 2026-08-11 01:43 UTCGHSA enrichment
  69. 2026-08-10 23:59 UTCEPSS rescore
  70. 2026-08-10 21:56 UTCGHSA enrichment
  71. 2026-08-10 18:09 UTCGHSA enrichment
  72. 2026-08-10 14:22 UTCGHSA enrichment
  73. 2026-08-10 10:35 UTCGHSA enrichment
  74. 2026-08-10 06:46 UTCGHSA enrichment
  75. 2026-08-10 02:59 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-10090?
CVE-2026-10090 is a critical vulnerability published on August 5, 2026. A flaw was found in the Application Subscription controller (multicluster-operators-subscription) of Red Hat Advanced Cluster Management for Kubernetes (ACM). A user with namespace-scoped "edit" privileges in an ACM hub namespace can create a Channel resource pointing to a Helm repository they…
When was CVE-2026-10090 disclosed?
CVE-2026-10090 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10090 actively exploited?
CVE-2026-10090 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 83.7% of all scored CVEs.
What is the CVSS score of CVE-2026-10090?
CVE-2026-10090 has a CVSS v3 base score of 9.0 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.9.
How do I remediate CVE-2026-10090?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10090, 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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