CVE-2026-20863CWE-415

CVE-2026-20863

High · published January 13, 2026

CVSS v3.1
7.0
EPSS
0%
Percentile
31.8
In the wild
Unconfirmed
What it is

⚡ A sneaky double free in Windows Win32K is the key to privilege elevation for unauthorized users! Just imagine the chaos that could ensue! 😱 Think of it like a hotel guest who finds a way to duplicate their key card and access restricted areas. Just a quick mismanagement of resources, and suddenly, they can waltz into the VIP lounge without a second thought! An attacker could exploit this vulnerability to gain elevated privileges locally, potentially allowing them to control the system or access sensitive information. This could lead to data breaches or unauthorized changes in critical system settings, resulting in a massive security headache for everyone involved!

Put simply

Think of it like a hotel guest who finds a way to duplicate their key card and access restricted areas. Just a quick mismanagement of resources, and suddenly, they can waltz into the VIP lounge without a second thought! The double free flaw in Windows Win32K allows an authorized attacker to manipulate memory allocations, leading to local privilege escalation. This means they can potentially gain admin-like access to the system by exploiting this oversight.

What to do

An attacker could exploit this vulnerability to gain elevated privileges locally, potentially allowing them to control the system or access sensitive information. This could lead to data breaches or unauthorized changes in critical system settings, resulting in a massive security headache for everyone involved! To mitigate this vulnerability, ensure you apply the latest security updates from Microsoft as soon as they become available. Additionally, review access controls and ensure that only trusted users have system-level access. Staying vigilant with regular patching is crucial! You've got this! With a few quick fixes, your system can look forward to a safer future. 🛡️

The record
Technical detail
CVSS v3.1
7.0 · HIGH
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00389 · 31.8th percentile
Weakness
CWE-415 · Double Free
Published
2026-01-13T23:16Z
Affected products (6)
ProductVersionsFixed in
microsoft/windows_11_23h2< 10.0.22631.649110.0.22631.6491
microsoft/windows_11_24h2< 10.0.26100.762310.0.26100.7623
microsoft/windows_11_25h2< 10.0.26200.762310.0.26200.7623
microsoft/windows_server_2022< 10.0.20348.464810.0.20348.4648
microsoft/windows_server_2022_23h2< 10.0.25398.209210.0.25398.2092
microsoft/windows_server_2025< 10.0.26100.3223010.0.26100.32230
References (1)
EPSS history
Timeline
  • 13 JAN 17:56Z
    Win32k Elevation of Privilege Vulnerability
    cvelistv5