CVE-2026-66878

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-08-12. the CNA's CVSS baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 4 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.7Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in multicloud-operators-subscription. A privileged user, specifically a namespace administrator capable of creating Channel and Subscription resources, can exploit this vulnerability. By manipulating the Channel.Spec.SecretRef.Namespace field, the user can cause the system to copy sensitive Secret contents from other namespaces into their own, leading to information disclosure.

CVSS v3
7.7
EG Score
7.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity77% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

August 12, 2026

Last Modified

September 5, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
Patch available. Sources: redhat.
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2514226
redhat Patch Available

CVE-2026-66878 - 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-2026-66878

Vendor Advisories for CVE-2026-66878(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-rhel9:17872421082026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872400302026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872636932026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872635842026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17871708302026-08-26redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17872423212026-08-26redhat

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 33× in last 7d / 152× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-66878?
CVE-2026-66878 is a high vulnerability published on August 12, 2026. A flaw was found in multicloud-operators-subscription. A privileged user, specifically a namespace administrator capable of creating Channel and Subscription resources, can exploit this vulnerability. By manipulating the Channel.Spec.SecretRef.Namespace field, the user can cause the system to copy…
When was CVE-2026-66878 disclosed?
CVE-2026-66878 was first published in the National Vulnerability Database on August 12, 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-2026-66878 actively exploited?
CVE-2026-66878 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 79.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66878?
CVE-2026-66878 has a CVSS v4.0 base score of 7.7 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66878?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66878, 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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