CVE-2026-83717

7.0High

Published 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

7.0High

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-416

Impact

Local attackers with standard user credentials can escalate privileges to SYSTEM. They need existing local shell access or code execution on the target Windows host.

Root cause

A use-after-free flaw in the Windows Installer service leaves dangling pointers that can be triggered during package processing.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the official Windows security update released for CVE-2026-83717 via Windows Update or WSUS. If patching immediately is not possible, restrict standard user access to invoke MSI installations via Group Policy or disable the Windows Installer service.

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Use after free in Windows Installer allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83717

Source: nvd.nist.gov/vuln/detail/CVE-2026-83717