CVE-2026-10090

CRITICALPre-NVD 9.09.9▲
EchelonGraph scoreMEDIUM 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 — 4 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

A fix is available — apply it.

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(medium)
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
30%
KEV
Not listed

Published

August 5, 2026

Last Modified

September 8, 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(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/multicluster-operators-subscription-rhel9:17871708302026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872423212026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872635842026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872636932026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872400302026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872421082026-08-26redhat

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 75× in last 7d / 302× 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 438 total refreshes for this CVE.

  1. 2026-09-19 03:28 UTCVendor advisory
  2. 2026-09-19 03:28 UTCGHSA enrichment
  3. 2026-09-18 22:21 UTCEG score recompute
  4. 2026-09-18 22:21 UTCVendor advisory
  5. 2026-09-18 22:21 UTCGHSA enrichment
  6. 2026-09-18 19:27 UTCEPSS rescore
  7. 2026-09-18 17:45 UTCVendor advisory
  8. 2026-09-18 17:45 UTCGHSA enrichment
  9. 2026-09-18 13:16 UTCVendor advisory
  10. 2026-09-18 13:16 UTCGHSA enrichment
  11. 2026-09-18 08:44 UTCVendor advisory
  12. 2026-09-18 08:44 UTCGHSA enrichment
  13. 2026-09-18 04:54 UTCVendor advisory
  14. 2026-09-18 04:54 UTCGHSA enrichment
  15. 2026-09-18 01:07 UTCEG score recompute
  16. 2026-09-18 01:07 UTCVendor advisory
  17. 2026-09-18 01:07 UTCGHSA enrichment
  18. 2026-09-17 15:58 UTCVendor advisory
  19. 2026-09-17 15:58 UTCGHSA enrichment
  20. 2026-09-17 08:43 UTCVendor advisory
  21. 2026-09-17 08:43 UTCGHSA enrichment
  22. 2026-09-17 04:55 UTCVendor advisory
  23. 2026-09-17 04:55 UTCGHSA enrichment
  24. 2026-09-17 01:08 UTCEG score recompute
  25. 2026-09-17 01:08 UTCVendor advisory
Show 75 more
  1. 2026-09-17 01:08 UTCGHSA enrichment
  2. 2026-09-16 11:13 UTCVendor advisory
  3. 2026-09-16 11:13 UTCGHSA enrichment
  4. 2026-09-16 07:04 UTCEG score recompute
  5. 2026-09-16 07:04 UTCVendor advisory
  6. 2026-09-16 07:04 UTCGHSA enrichment
  7. 2026-09-16 05:14 UTCEPSS rescore
  8. 2026-09-16 03:16 UTCVendor advisory
  9. 2026-09-16 03:16 UTCGHSA enrichment
  10. 2026-09-15 16:27 UTCVendor advisory
  11. 2026-09-15 16:27 UTCGHSA enrichment
  12. 2026-09-15 06:52 UTCEG score recompute
  13. 2026-09-15 06:52 UTCVendor advisory
  14. 2026-09-15 06:52 UTCGHSA enrichment
  15. 2026-09-15 01:31 UTCVendor advisory
  16. 2026-09-15 01:31 UTCGHSA enrichment
  17. 2026-09-14 14:29 UTCVendor advisory
  18. 2026-09-14 14:29 UTCGHSA enrichment
  19. 2026-09-14 10:38 UTCVendor advisory
  20. 2026-09-14 10:38 UTCGHSA enrichment
  21. 2026-09-14 06:51 UTCVendor advisory
  22. 2026-09-14 06:51 UTCGHSA enrichment
  23. 2026-09-14 03:04 UTCVendor advisory
  24. 2026-09-14 03:04 UTCGHSA enrichment
  25. 2026-09-13 23:17 UTCVendor advisory
  26. 2026-09-13 23:17 UTCGHSA enrichment
  27. 2026-09-13 19:30 UTCEG score recompute
  28. 2026-09-13 19:30 UTCVendor advisory
  29. 2026-09-13 19:30 UTCGHSA enrichment
  30. 2026-09-13 16:46 UTCEPSS rescore
  31. 2026-09-13 15:05 UTCVendor advisory
  32. 2026-09-13 15:05 UTCGHSA enrichment
  33. 2026-09-13 10:58 UTCVendor advisory
  34. 2026-09-13 10:58 UTCGHSA enrichment
  35. 2026-09-13 07:10 UTCVendor advisory
  36. 2026-09-13 07:10 UTCGHSA enrichment
  37. 2026-09-13 03:24 UTCVendor advisory
  38. 2026-09-13 03:24 UTCGHSA enrichment
  39. 2026-09-12 23:37 UTCVendor advisory
  40. 2026-09-12 23:37 UTCGHSA enrichment
  41. 2026-09-12 19:50 UTCVendor advisory
  42. 2026-09-12 19:50 UTCGHSA enrichment
  43. 2026-09-12 16:03 UTCEG score recompute
  44. 2026-09-12 16:03 UTCVendor advisory
  45. 2026-09-12 16:03 UTCGHSA enrichment
  46. 2026-09-12 15:00 UTCEPSS rescore
  47. 2026-09-12 12:16 UTCVendor advisory
  48. 2026-09-12 12:16 UTCGHSA enrichment
  49. 2026-09-12 08:01 UTCVendor advisory
  50. 2026-09-12 08:01 UTCGHSA enrichment
  51. 2026-09-12 04:14 UTCVendor advisory
  52. 2026-09-12 04:14 UTCGHSA enrichment
  53. 2026-09-12 00:23 UTCVendor advisory
  54. 2026-09-12 00:23 UTCGHSA enrichment
  55. 2026-09-11 18:29 UTCEG score recompute
  56. 2026-09-11 18:29 UTCVendor advisory
  57. 2026-09-11 18:29 UTCGHSA enrichment
  58. 2026-09-11 14:52 UTCEPSS rescore
  59. 2026-09-11 14:42 UTCEG score recompute
  60. 2026-09-11 14:42 UTCVendor advisory
  61. 2026-09-11 14:42 UTCGHSA enrichment
  62. 2026-09-11 09:36 UTCEPSS rescore
  63. 2026-09-11 09:07 UTCVendor advisory
  64. 2026-09-11 09:07 UTCGHSA enrichment
  65. 2026-09-11 05:20 UTCVendor advisory
  66. 2026-09-11 05:20 UTCGHSA enrichment
  67. 2026-09-11 01:33 UTCVendor advisory
  68. 2026-09-11 01:33 UTCGHSA enrichment
  69. 2026-09-10 21:44 UTCVendor advisory
  70. 2026-09-10 21:44 UTCGHSA enrichment
  71. 2026-09-10 17:56 UTCVendor advisory
  72. 2026-09-10 17:56 UTCGHSA enrichment
  73. 2026-09-10 12:47 UTCEG score recompute
  74. 2026-09-10 12:47 UTCVendor advisory
  75. 2026-09-10 12:47 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 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-2026-10090 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 69.7% 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.

Dependency Blast Radius

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