CVE-2026-21517 Windows App for Mac Installer Elevation of Privilege Vulnerability
An authorized local attacker can elevate privileges via improper link resolution in the Windows App for Mac installer.
- 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-2026-21517?
CVE-2026-21517 is a medium-severity path traversal vulnerability in Microsoft Windows App for Mac, published on 10 Feb 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 Windows App for Mac allows an authorized attacker to elevate privileges locally.
Weakness: CWE-59
Which versions are affected by CVE-2026-21517?
It affects 1 product.
Products include Microsoft Windows App.
How do I fix CVE-2026-21517?
No fix has been published for CVE-2026-21517 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-2026-21517 being exploited?
There is no known exploitation of CVE-2026-21517 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows App for Mac
- CVE-2026-59124 Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability
- CVE-2026-59133 Microsoft High Performance Computing (HPC) Pack Elevation of Privilege Vulnerability
- CVE-2020-0919 Privilege escalation in Microsoft Remote Desktop for Mac
- CVE-2026-69550 Windows App for Mac Information Disclosure Vulnerability
- CVE-2026-23656 Windows App Installer Spoofing Vulnerability
Sources
Also known as GHSA-px7f-389h-299v.