CASCACascade Atlas

Evidence dossier

CVE-2026-21519

Desktop Window Manager Elevation of Privilege Vulnerability

62.6–77.6Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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

State
PUBLISHED
Published
Feb 10, 2026
Updated
May 11, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS2.42%

2026-07-18 · v2026.06.15 · percentile 82.3%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

microsoftoriginal assertion
container

Desktop Window Manager Elevation of Privilege Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Microsoft Windows Type Confusion Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.024200000000; percentile 0.823280000000

Applicability

Cited product scope

Trace impact →
MicrosoftWindows 10 Version 1607
[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8868", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 1809
[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8389", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 21H2
[{"status": "affected", "version": "10.0.19044.0", "lessThan": "10.0.19044.6937", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 22H2
[{"status": "affected", "version": "10.0.19045.0", "lessThan": "10.0.19045.6937", "versionType": "custom"}]unknown
MicrosoftWindows 11 version 22H3
[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6649", "versionType": "custom"}]unknown
MicrosoftWindows 11 Version 23H2
[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6649", "versionType": "custom"}]unknown
MicrosoftWindows 11 Version 24H2
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.7840", "versionType": "custom"}]unknown
MicrosoftWindows 11 Version 25H2
[{"status": "affected", "version": "10.0.26200.0", "lessThan": "10.0.26200.7840", "versionType": "custom"}]unknown
MicrosoftWindows 11 version 26H1
[{"status": "affected", "version": "10.0.28000.0", "lessThan": "10.0.28000.1575", "versionType": "custom"}]unknown
MicrosoftWindows 11 Version 26H1
[{"status": "affected", "version": "10.0.28000.0", "lessThan": "10.0.28000.1575", "versionType": "custom"}]unknown
MicrosoftWindows Server 2016
[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8868", "versionType": "custom"}]unknown
MicrosoftWindows Server 2016 (Server Core installation)
[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8868", "versionType": "custom"}]unknown
MicrosoftWindows Server 2019
[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8389", "versionType": "custom"}]unknown
MicrosoftWindows Server 2019 (Server Core installation)
[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8389", "versionType": "custom"}]unknown
MicrosoftWindows Server 2022
[{"status": "affected", "version": "10.0.20348.0", "lessThan": "10.0.20348.4773", "versionType": "custom"}]unknown
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)
[{"status": "affected", "version": "10.0.25398.0", "lessThan": "10.0.25398.2149", "versionType": "custom"}]unknown
MicrosoftWindows Server 2025
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.32370", "versionType": "custom"}]unknown
MicrosoftWindows Server 2025 (Server Core installation)
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.32370", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*; end excluding 10.0.14393.8868supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*; end excluding 10.0.14393.8868supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*; end excluding 10.0.17763.8389supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*; end excluding 10.0.17763.8389supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.19044.6937supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*; end excluding 10.0.19044.6937supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*; end excluding 10.0.19044.6937supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.19045.6937supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*; end excluding 10.0.19045.6937supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*; end excluding 10.0.19045.6937supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.22631.6649supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*; end excluding 10.0.22631.6649supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.26100.7781supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*; end excluding 10.0.26100.7781supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.26200.7781supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*; end excluding 10.0.26200.7781supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*; end excluding 10.0.14393.8868supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*; end excluding 10.0.17763.8389supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*; end excluding 10.0.20348.4711supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*; end excluding 10.0.25398.2149supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*; end excluding 10.0.26100.32313supported

Assessments

CVSS by origin

7.8
secure@microsoft.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8
microsoftCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.