CVE-2026-83698

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-122

Impact

A local attacker with standard user access can elevate privileges to SYSTEM. They need existing execution permissions and a valid account on the local Windows machine.

Root cause

A heap-based buffer overflow bug exists in the Windows Client-Side Caching (CSC) Service.

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 relevant Microsoft security update referenced in the MSRC advisory; if unable to patch immediately, disable the Offline Files / Client-Side Caching service (CscService).

shell

$ powershell -Command "Stop-Service -Name CscService -Force; Set-Service -Name CscService -StartupType Disabled"

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

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NVD description

Heap-based buffer overflow in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83698

Source: nvd.nist.gov/vuln/detail/CVE-2026-83698