CVE-2026-56177

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. 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.

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

CVSS v3
7.8
EG Score
7.8(high)
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
24%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 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-2026-56177

Vendor Advisories for CVE-2026-56177(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 52× in last 7d / 82× 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.

  1. 2026-09-18 21:06 UTCEG score recompute
  2. 2026-09-18 21:06 UTCVendor advisory
  3. 2026-09-18 21:06 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 14:12 UTCVendor advisory
  6. 2026-09-18 14:12 UTCGHSA enrichment
  7. 2026-09-18 11:10 UTCVendor advisory
  8. 2026-09-18 11:10 UTCGHSA enrichment
  9. 2026-09-17 23:06 UTCVendor advisory
  10. 2026-09-17 23:06 UTCGHSA enrichment
  11. 2026-09-17 19:55 UTCEG score recompute
  12. 2026-09-17 19:55 UTCVendor advisory
  13. 2026-09-17 19:55 UTCGHSA enrichment
  14. 2026-09-17 19:31 UTCEPSS rescore
  15. 2026-09-17 18:49 UTCEG score recompute
  16. 2026-09-17 18:49 UTCVendor advisory
  17. 2026-09-17 18:48 UTCGHSA enrichment
  18. 2026-09-17 10:16 UTCVendor advisory
  19. 2026-09-17 10:16 UTCGHSA enrichment
  20. 2026-09-16 22:12 UTCEG score recompute
  21. 2026-09-16 22:12 UTCVendor advisory
  22. 2026-09-16 22:12 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 10:51 UTCEG score recompute
  25. 2026-09-16 10:51 UTCVendor advisory
Show 57 more
  1. 2026-09-16 10:51 UTCGHSA enrichment
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 22:47 UTCVendor advisory
  4. 2026-09-15 22:47 UTCGHSA enrichment
  5. 2026-09-15 17:58 UTCVendor advisory
  6. 2026-09-15 17:58 UTCGHSA enrichment
  7. 2026-09-15 11:01 UTCEG score recompute
  8. 2026-09-15 11:01 UTCVendor advisory
  9. 2026-09-15 11:01 UTCGHSA enrichment
  10. 2026-09-15 03:11 UTCEPSS rescore
  11. 2026-09-14 22:57 UTCVendor advisory
  12. 2026-09-14 22:57 UTCGHSA enrichment
  13. 2026-09-14 17:49 UTCVendor advisory
  14. 2026-09-14 17:49 UTCGHSA enrichment
  15. 2026-09-14 08:26 UTCVendor advisory
  16. 2026-09-14 08:26 UTCGHSA enrichment
  17. 2026-09-13 20:22 UTCEG score recompute
  18. 2026-09-13 20:22 UTCVendor advisory
  19. 2026-09-13 20:22 UTCGHSA enrichment
  20. 2026-09-13 16:47 UTCEPSS rescore
  21. 2026-09-13 08:17 UTCVendor advisory
  22. 2026-09-13 08:17 UTCGHSA enrichment
  23. 2026-09-12 20:14 UTCEG score recompute
  24. 2026-09-12 20:14 UTCVendor advisory
  25. 2026-09-12 20:14 UTCGHSA enrichment
  26. 2026-09-12 08:10 UTCVendor advisory
  27. 2026-09-12 08:10 UTCGHSA enrichment
  28. 2026-09-11 20:06 UTCVendor advisory
  29. 2026-09-11 20:06 UTCGHSA enrichment
  30. 2026-09-11 17:02 UTCEG score recompute
  31. 2026-09-11 17:02 UTCVendor advisory
  32. 2026-09-11 17:02 UTCGHSA enrichment
  33. 2026-09-11 14:53 UTCEPSS rescore
  34. 2026-09-11 10:36 UTCEG score recompute
  35. 2026-09-11 10:36 UTCGHSA enrichment
  36. 2026-09-10 22:27 UTCGHSA enrichment
  37. 2026-09-10 10:23 UTCEG score recompute
  38. 2026-09-10 10:23 UTCGHSA enrichment
  39. 2026-09-10 09:35 UTCEPSS rescore
  40. 2026-09-09 22:18 UTCGHSA enrichment
  41. 2026-09-09 20:09 UTCVendor advisory
  42. 2026-09-09 20:08 UTCGHSA enrichment
  43. 2026-09-09 10:19 UTCVendor advisory
  44. 2026-09-09 10:19 UTCGHSA enrichment
  45. 2026-09-09 04:35 UTCVendor advisory
  46. 2026-09-09 04:35 UTCGHSA enrichment
  47. 2026-09-09 04:07 UTCEG score recompute
  48. 2026-09-09 04:07 UTCVendor advisory
  49. 2026-09-09 04:07 UTCGHSA enrichment
  50. 2026-09-08 23:43 UTCEG score recompute
  51. 2026-09-08 23:43 UTCVendor advisory
  52. 2026-09-08 23:43 UTCGHSA enrichment
  53. 2026-09-08 18:57 UTCEG score recompute
  54. 2026-09-08 18:57 UTCGHSA enrichment
  55. 2026-09-08 17:55 UTCEG score recompute
  56. 2026-09-08 17:55 UTCVendor advisory
  57. 2026-09-08 17:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-56177?
CVE-2026-56177 is a high vulnerability published on September 8, 2026. Use after free in Windows Server allows an authorized attacker to elevate privileges locally.
When was CVE-2026-56177 disclosed?
CVE-2026-56177 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56177 actively exploited?
CVE-2026-56177 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 75.9% of all scored CVEs.
What is the CVSS score of CVE-2026-56177?
CVE-2026-56177 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-56177?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56177, 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-2026-56177

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