CVE-2026-77899

HIGHPre-NVD 7.07.0—
EchelonGraph scoreHIGH confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. the CNA's CVSS baseline 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: None knownExposed: 0

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

Use after free in Windows Security Center allows an authorized attacker to elevate privileges locally.

CVSS v3
7.0
EG Score
7.0(high)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity70% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 24, 2026

Advisory Details (1)

Auto-updated Sep 8, 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-2026-77899

Vendor Advisories for CVE-2026-77899(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 50× in last 7d / 126× 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 126 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-77899?
CVE-2026-77899 is a high vulnerability published on September 8, 2026. Use after free in Windows Security Center allows an authorized attacker to elevate privileges locally.
When was CVE-2026-77899 disclosed?
CVE-2026-77899 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77899 actively exploited?
CVE-2026-77899 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 83.8% of all scored CVEs.
What is the CVSS score of CVE-2026-77899?
CVE-2026-77899 has a CVSS v4.0 base score of 7.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-77899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77899, 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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