CVE-2026-21519

HIGHNVD 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 2%CVSS: 7.8Exploit: NoneExposed: 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
82.4%
KEV
⚠ Exploited

Published

February 10, 2026

Last Modified

February 11, 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 93× in last 7d / 416× 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 746 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2026-21519?
CVE-2026-21519 is a high 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 February 11, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-21519

Explore →

Is Your Infrastructure Affected by CVE-2026-21519?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs