CVE-2026-77892

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory published 2026-09-08. the CNA's CVSS baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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

No cwe for this issue in Windows Boot Manager allows an unauthorized attacker to elevate privileges with a physical attack.

CVSS v3
6.8
EG Score
6.8(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
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-2026-77892

Vendor Advisories for CVE-2026-77892(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 41× in last 7d / 70× 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. 2026-09-19 22:03 UTCEG score recompute
  2. 2026-09-19 22:03 UTCVendor advisory
  3. 2026-09-19 22:03 UTCGHSA enrichment
  4. 2026-09-18 21:08 UTCEG score recompute
  5. 2026-09-18 21:08 UTCVendor advisory
  6. 2026-09-18 21:08 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 14:14 UTCVendor advisory
  9. 2026-09-18 14:14 UTCGHSA enrichment
  10. 2026-09-17 23:09 UTCVendor advisory
  11. 2026-09-17 23:09 UTCGHSA enrichment
  12. 2026-09-17 20:12 UTCVendor advisory
  13. 2026-09-17 20:12 UTCGHSA enrichment
  14. 2026-09-17 19:56 UTCEG score recompute
  15. 2026-09-17 19:56 UTCVendor advisory
  16. 2026-09-17 19:56 UTCGHSA enrichment
  17. 2026-09-16 22:13 UTCEG score recompute
  18. 2026-09-16 22:13 UTCVendor advisory
  19. 2026-09-16 22:13 UTCGHSA enrichment
  20. 2026-09-16 15:31 UTCEG score recompute
  21. 2026-09-16 15:31 UTCVendor advisory
  22. 2026-09-16 15:31 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 05:15 UTCEPSS rescore
  25. 2026-09-15 23:07 UTCVendor advisory
Show 45 more
  1. 2026-09-15 23:07 UTCGHSA enrichment
  2. 2026-09-15 18:02 UTCEG score recompute
  3. 2026-09-15 18:02 UTCVendor advisory
  4. 2026-09-15 18:02 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 22:59 UTCVendor advisory
  8. 2026-09-14 22:59 UTCGHSA enrichment
  9. 2026-09-14 17:51 UTCVendor advisory
  10. 2026-09-14 17:51 UTCGHSA enrichment
  11. 2026-09-14 00:49 UTCEG score recompute
  12. 2026-09-14 00:49 UTCVendor advisory
  13. 2026-09-14 00:49 UTCGHSA enrichment
  14. 2026-09-12 23:56 UTCEG score recompute
  15. 2026-09-12 23:56 UTCVendor advisory
  16. 2026-09-12 23:56 UTCGHSA enrichment
  17. 2026-09-11 23:02 UTCVendor advisory
  18. 2026-09-11 23:02 UTCGHSA enrichment
  19. 2026-09-11 19:44 UTCVendor advisory
  20. 2026-09-11 19:44 UTCGHSA enrichment
  21. 2026-09-11 17:05 UTCEG score recompute
  22. 2026-09-11 17:05 UTCVendor advisory
  23. 2026-09-11 17:05 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 23:39 UTCEG score recompute
  26. 2026-09-10 23:39 UTCGHSA enrichment
  27. 2026-09-10 09:35 UTCEPSS rescore
  28. 2026-09-09 22:30 UTCGHSA enrichment
  29. 2026-09-09 20:13 UTCEG score recompute
  30. 2026-09-09 20:13 UTCVendor advisory
  31. 2026-09-09 20:13 UTCGHSA enrichment
  32. 2026-09-09 19:32 UTCEG score recompute
  33. 2026-09-09 19:32 UTCVendor advisory
  34. 2026-09-09 19:31 UTCGHSA enrichment
  35. 2026-09-09 19:00 UTCEG score recompute
  36. 2026-09-09 19:00 UTCVendor advisory
  37. 2026-09-09 19:00 UTCGHSA enrichment
  38. 2026-09-09 00:10 UTCEG score recompute
  39. 2026-09-09 00:10 UTCVendor advisory
  40. 2026-09-09 00:10 UTCGHSA enrichment
  41. 2026-09-08 19:01 UTCEG score recompute
  42. 2026-09-08 19:01 UTCGHSA enrichment
  43. 2026-09-08 17:57 UTCEG score recompute
  44. 2026-09-08 17:57 UTCVendor advisory
  45. 2026-09-08 17:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77892?
CVE-2026-77892 is a medium vulnerability published on September 8, 2026. No cwe for this issue in Windows Boot Manager allows an unauthorized attacker to elevate privileges with a physical attack.
When was CVE-2026-77892 disclosed?
CVE-2026-77892 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-2026-77892 actively exploited?
CVE-2026-77892 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 76.6% of all scored CVEs.
What is the CVSS score of CVE-2026-77892?
CVE-2026-77892 has a CVSS v4.0 base score of 6.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-77892?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77892, 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-2026-77892

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