CVE-2026-42977

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. 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.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications 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
8%
KEV
Not listed

Published

June 9, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Jun 9, 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-2026-42977

Vendor Advisories for CVE-2026-42977(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 8× in last 7d / 40× 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 358 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42977?
CVE-2026-42977 is a high vulnerability published on June 9, 2026. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
When was CVE-2026-42977 disclosed?
CVE-2026-42977 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42977 actively exploited?
CVE-2026-42977 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 91.6% of all scored CVEs.
What is the CVSS score of CVE-2026-42977?
CVE-2026-42977 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42977, 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-2026-42977

Explore →

Is Your Infrastructure Affected by CVE-2026-42977?

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

Start Free Scan →Browse All CVEs