CVE-2026-42834

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-20. the CNA's CVSS baseline 7.8; sources differ by 0.0.

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

Improper access control in Windows Admin Center allows an authorized attacker to elevate privileges over a network.

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
34%
KEV
Not listed

Published

May 20, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated May 20, 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-2026-42834

Vendor Advisories for CVE-2026-42834(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 5× in last 7d / 82× 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 273 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42834?
CVE-2026-42834 is a high vulnerability published on May 20, 2026. Improper access control in Windows Admin Center allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-42834 disclosed?
CVE-2026-42834 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42834 actively exploited?
CVE-2026-42834 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 66.0% of all scored CVEs.
What is the CVSS score of CVE-2026-42834?
CVE-2026-42834 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42834?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42834, 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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