What is CVE-2026-21517?

CVE-2026-21517 is a medium-severity vulnerability in Microsoft Windows_app, classified under Improper Link Resolution Before File Access. CVSS score: 4.7/10. Published 2026-02-10.

How severe is CVE-2026-21517?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Microsoft Windows_app

CVE-2026-21517

Improper link resolution before file access ('link following') in Windows App for Mac allows an authorized attacker to elevate privileges locally.

EPSS: 0.004 (27.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Microsoft Windows_app
Microsoft Windows App For Mac — versions 11.0.0

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21517?: CVE-2026-21517 is a medium-severity vulnerability in Microsoft Windows_app, classified under Improper Link Resolution Before File Access. CVSS score: 4.7/10. Published 2026-02-10.
How severe is CVE-2026-21517?: Medium severity. CVSS v3 base score is 4.7 out of 10.