CVE-2026-34343

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-12. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
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.

Heap-based buffer overflow in Windows Application Identity (AppID) Subsystem allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
24.6%
KEV
Not listed

Published

May 12, 2026

Last Modified

June 19, 2026

Advisory Details (1)

Auto-updated May 14, 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-2026-34343

Vendor Advisories for CVE-2026-34343(1)

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 / 67× 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 195 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34343?
CVE-2026-34343 is a high vulnerability published on May 12, 2026. Heap-based buffer overflow in Windows Application Identity (AppID) Subsystem allows an authorized attacker to elevate privileges locally.
When was CVE-2026-34343 disclosed?
CVE-2026-34343 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34343 actively exploited?
CVE-2026-34343 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34343?
CVE-2026-34343 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-34343?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34343, 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.

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