What is CVE-2026-48563?

CVE-2026-48563 is a high-severity vulnerability in Microsoft Windows_10_1809, classified under Use After Free. CVSS score: 7.5/10. Published 2026-06-09.

How severe is CVE-2026-48563?

High severity. CVSS v3 base score is 7.5 out of 10.

Use After Free in Microsoft Windows_10_1809

CVE-2026-48563

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Microsoft Windows_10_1809
Microsoft Windows_10_21h2
Microsoft Windows_10_22h2
Microsoft Windows_11_23h2
Microsoft Windows_11_24h2
Microsoft Windows_11_25h2
Microsoft Windows_11_26h1
Microsoft Windows_server_2019
Microsoft Windows_server_2022
Microsoft Windows_server_2025

Weakness classification (CWE)

CWE-416 — Use After Free
CWE-787 — Out-of-bounds Write

References

secure@microsoft.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-48563?: CVE-2026-48563 is a high-severity vulnerability in Microsoft Windows_10_1809, classified under Use After Free. CVSS score: 7.5/10. Published 2026-06-09.
How severe is CVE-2026-48563?: High severity. CVSS v3 base score is 7.5 out of 10.