Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

Summary

Integer underflow (wrap or wraparound) in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally. Published in August 2026 Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-62696. Confirm whether Windows Program Compatibility Assistant Service is deployed, then apply the current security update or documented mitigation. CVSS score: 7.8.

Sources