CVE-2026-42991

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
6.9%
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-2026-42991

Vendor Advisories for CVE-2026-42991(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 40× in last 7d / 178× 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 178 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42991?
CVE-2026-42991 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-2026-42991 disclosed?
CVE-2026-42991 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-2026-42991 actively exploited?
CVE-2026-42991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42991?
CVE-2026-42991 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42991, 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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