CVE-2026-65816

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. The CNA's CVSS baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 10.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Use of incorrectly-resolved name or reference in Azure Arc allows an unauthorized attacker to elevate privileges over a network.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
60
EG Risk 60/100CISA SSVC

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
Severity100% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 29, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65816

Vendor Advisories for CVE-2026-65816(2)

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 76× in last 7d / 343× 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 580 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-65816?
CVE-2026-65816 is a critical vulnerability published on August 20, 2026. Use of incorrectly-resolved name or reference in Azure Arc allows an unauthorized attacker to elevate privileges over a network.
When was CVE-2026-65816 disclosed?
CVE-2026-65816 was first published on August 20, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65816 actively exploited?
CVE-2026-65816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-65816?
CVE-2026-65816 has a CVSS base score of 10.0 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-65816?
A fix for CVE-2026-65816 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-65816 are linked in the Vendor Advisories panel on this page.

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