CVE-2026-21519

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-02-10), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
84%
KEV
⚠ Exploited

Published

February 10, 2026

Last Modified

August 19, 2026

Advisory Details (2)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21519
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-2026-21519

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 101× in last 7d / 426× 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 1,543 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2026-21519?
CVE-2026-21519 is a critical vulnerability published on February 10, 2026. Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
When was CVE-2026-21519 disclosed?
CVE-2026-21519 was first published in the National Vulnerability Database on February 10, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21519 actively exploited?
Yes. CISA added CVE-2026-21519 to the Known Exploited Vulnerabilities catalog on February 10, 2026, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-21519?
CVE-2026-21519 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-21519?
CVE-2026-21519 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-21519?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21519, 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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