CVE-2026-100203
HighCVSS 7.0Summary
Heap-based buffer overflow in Windows Update Service allows an authorized attacker to elevate privileges locally.
Risk Assessment
An authenticated attacker with local access can exploit this vulnerability to escalate privileges and gain administrative control over the system.
Recommendation
Install the latest Windows security updates and restrict local access to trusted users.
Other vulnerabilities in Windows Update Service
See all- CVE-2026-70142High
Untrusted search path in Windows Update Service. An authorized attacker can exploit this to elevate privileges locally.
- CVE-2026-70139High
Heap-based buffer overflow in Windows Update Service. An authorized attacker can exploit this to elevate privileges locally.
- CVE-2026-70056High
A use after free vulnerability exists in the Windows Update Service. An authorized attacker can exploit this flaw to elevate privileges locally.
- CVE-2026-100200High
A use-after-free vulnerability in the Windows Update Service allows an authorized attacker to elevate privileges locally. The flaw resides in the system component responsible for updates.
- CVE-2021-26866High
Elevation of privilege vulnerability in Windows Update Service. Allows an attacker to gain higher privileges on the system.
Original NVD description (English source)
Heap-based buffer overflow in Windows Update Service allows an authorized attacker to elevate privileges locally.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS