CVE-2026-83698 Windows Client-Side Caching (CSC) Service Elevation of Privilege Vulnerability
A heap-based buffer overflow in the Windows Client-Side Caching service allows local attackers to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83698?
CVE-2026-83698 is a high-severity memory corruption vulnerability in Microsoft Windows 10 Version 1607, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Heap-based buffer overflow in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.
Weakness: CWE-122
Which versions are affected by CVE-2026-83698?
How do I fix CVE-2026-83698?
No fix has been published for CVE-2026-83698 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-83698 being exploited?
There is no known exploitation of CVE-2026-83698 in the wild and no public exploit code.
Sources
Also known as GHSA-q7m2-r25p-88m7.