CVE-2026-42977

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH 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
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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(high)
EPSS
8.3%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 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 42× in last 7d / 184× 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 184 total refreshes for this CVE.

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

Related CVEs(same vendor + 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 July 1, 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 8.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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