Local privilege escalation via freed object reuse
Published Sep 8, 2026 · Updated Sep 10, 2026
Use-after-free in Microsoft Windows Device Association Service allows local users with low privileges to gain elevated privileges. Microsoft identifies a freed-object lifetime error in the service but has not published the affected function, object type, or triggering operation. Successful exploitation requires local low-privileged access, no user interaction, and high-complexity conditions, and can compromise system confidentiality, integrity, and availability.
Summary
What happened
Use-after-free in Microsoft Windows Device Association Service allows local users with low privileges to gain elevated privileges. Microsoft identifies a freed-object lifetime error in the service but has not published the affected function, object type, or triggering operation. Successful exploitation requires local low-privileged access, no user interaction, and high-complexity conditions, and can compromise system confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-83940
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9245
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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