CVE-2026-50399

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Out-of-bounds read in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
7.8(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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 14, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Jul 15, 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-2026-50399

Vendor Advisories for CVE-2026-50399(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 34× 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 239 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-50399?
CVE-2026-50399 is a high vulnerability published on July 14, 2026. Out-of-bounds read in Windows Kernel allows an authorized attacker to elevate privileges locally.
When was CVE-2026-50399 disclosed?
CVE-2026-50399 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50399 actively exploited?
CVE-2026-50399 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 74.2% of all scored CVEs.
What is the CVSS score of CVE-2026-50399?
CVE-2026-50399 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-50399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50399, 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

Explore the affected products and dependency analysis for CVE-2026-50399

Explore →

Is Your Infrastructure Affected by CVE-2026-50399?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs