Out-of-bounds Read in Microsoft Windows_11_23h2
CVE-2026-45604
Out-of-bounds read in Windows Application Identity (AppID) Subsystem allows an authorized attacker to disclose information locally.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (26.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Microsoft Windows_11_23h2
- Microsoft Windows_11_24h2
- Microsoft Windows_11_25h2
- Microsoft Windows_11_26h1
- Microsoft Windows 11 Version 23h2 — versions 10.0.22631.0
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
- Microsoft Windows 11 Version 26h1 — versions 10.0.28000.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows_server_2025
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45604?
- CVE-2026-45604 is a medium-severity vulnerability in Microsoft Windows_11_23h2, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-06-09.
- How severe is CVE-2026-45604?
- Medium severity. CVSS v3 base score is 5.5 out of 10.