CVE-2026-83840

7.8High

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

7.8High

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-1390

Impact

Local attackers with low-privilege access can elevate privileges to system level. They need existing local account access to run code on the target machine.

Root cause

Windows Error Reporting contains a weak authentication flaw that fails to properly restrict unauthorized local privilege escalation.

Affected systems

Versions not listed — check the vendor advisory.

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

Fix & remediation

Install the official security update from Microsoft corresponding to CVE-2026-83840 via Windows Update or WSUS. If immediate patching is not possible, disable the Windows Error Reporting Service (WerSvc) as a temporary mitigation.

shell

$ Stop-Service -Name WerSvc -Force; Set-Service -Name WerSvc -StartupType Disabled

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

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NVD description

Weak authentication in Windows Error Reporting allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83840

Source: nvd.nist.gov/vuln/detail/CVE-2026-83840