Local privilege escalation via integer underflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Privilege escalation in supported Microsoft Windows releases before the August 2026 security updates allows local users to gain SYSTEM privileges. Microsoft describes an integer underflow in the Program Compatibility Assistant Service, but public records do not identify the affected routine or the operation that wraps on user-supplied input. Exploitation requires code execution on the host and access to the local service path; retrieved records do not show remote reachability, public exploit code, or confirmed in-the-wild exploitation.
Summary
What happened
Privilege escalation in supported Microsoft Windows releases before the August 2026 security updates allows local users to gain SYSTEM privileges. Microsoft describes an integer underflow in the Program Compatibility Assistant Service, but public records do not identify the affected routine or the operation that wraps on user-supplied input. Exploitation requires code execution on the host and access to the local service path; retrieved records do not show remote reachability, public exploit code, or confirmed in-the-wild exploitation.
The record
- CVE
- CVE-2026-62696
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-191, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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