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Microsoft Windows 11 (version 24H2) Use-After-Free Rated 7.0 CVSS

Last refreshed2026-10-15

Status: UPDATED  |  Advisory ID: CVE-2026-78457

Key Details

CVECVE-2026-78457
CVSS Score / Version
7.0 (High) / CVSS v3.1
Updated2026-10-15
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Prose
attack vector is local; attack complexity is high; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
Microsoft Windows 11 (version 24H2), Microsoft Windows 11 (version 25H2), Microsoft Windows 11 (version 26H1), Microsoft Windows Server 2025, and Microsoft Windows Server 2022
Classified as
CWE-416 (Use After Free)
Exploitation prediction (EPSS)
0.26% probability of exploitation in the next 30 days (17% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftWindows 11 (version 24H2)
MicrosoftWindows 11 (version 25H2)
MicrosoftWindows 11 (version 26H1)
MicrosoftWindows Server 2025
MicrosoftWindows Server 2022
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Use after free in Windows Security App allows an authorized attacker to elevate privileges locally.

What to Do

Monitor Microsoft's web page for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-78457
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-78457
Vendor advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78457

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