CVE-2026-70264 Microsoft Defender Information Disclosure Vulnerability
An authorized local attacker can exploit improper link resolution in Microsoft Defender to disclose sensitive information.
- 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-2026-70264?
CVE-2026-70264 is a medium-severity path traversal vulnerability in Microsoft Windows Defender, 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
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to disclose information locally.
Weakness: CWE-59
Which versions are affected by CVE-2026-70264?
How do I fix CVE-2026-70264?
No fix has been published for CVE-2026-70264 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-70264 being exploited?
There is no known exploitation of CVE-2026-70264 in the wild and no public exploit code.
Sources
Also known as GHSA-878h-ggqr-r6qq.