P4Verified

CVE-2026-78457: windows 11 24h2 before 10.0.26100.9445 (exclusive); +10 more affected products

CVE-2026-78457. CVSS 3.1 base score 7.0 (HIGH, Vendor/CNA). EPSS 0.00264 (percentile 0.16923), scored 13-Oct-2026.

Affected technology

windows 11 24h2 · before 10.0.26100.9445 (exclusive)
microsoft

windows 11 25h2 · before 10.0.26200.9445 (exclusive)
microsoft

windows 11 26h1 · before 10.0.28000.2954 (exclusive)
microsoft

windows server 2022 · before 10.0.20348.5622 (exclusive)
microsoft

windows server 2025 · before 10.0.26100.33438 (exclusive)
microsoft

Windows 11 Version 24H2 · 10.0.26100.0 to before 10.0.26100.9445
Microsoft

Windows 11 Version 25H2 · 10.0.26200.0 to before 10.0.26200.9445
Microsoft

Windows 11 version 26H1 · 10.0.28000.0 to before 10.0.28000.2954
Microsoft

Windows Server 2022 · 10.0.20348.0 to before 10.0.20348.5622
Microsoft

Windows Server 2025 · 10.0.26100.0 to before 10.0.26100.33438
Microsoft

Windows Server 2025 (Server Core installation) · 10.0.26100.0 to before 10.0.26100.33438
Microsoft

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Local · Low privileges required · No user interaction required

What an attacker can do

The source says use after free in Windows Security App allows an authorized attacker to elevate privileges locally. Vendor/CNA’s CVSS 3.1 assessment (base score 7.0/10) rates confidentiality, integrity and availability impact as high.

Published 15-Oct-2026 01:10 UTC

CWE: CWE-416
CCR priority: 28.1 /100 (P4)
CVSS 3.1: 7.0 /10 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H · Vendor/CNA
EPSS: 0.00264 · percentile 0.16923 · 2026-10-13
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-15 01:07:31.726917+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-78457.html