What is CVE-2026-21223?

CVE-2026-21223 is a high-severity vulnerability in Microsoft Edge_chromium, classified under Improper Privilege Management. CVSS score: 7.1/10. Published 2026-01-16.

How severe is CVE-2026-21223?

High severity. CVSS v3 base score is 7.1 out of 10.

Privilege escalation in Microsoft Edge_chromium

CVE-2026-21223

Improper privilege management in Microsoft Edge (Chromium-based) allows an authorized attacker to bypass a security feature locally.

Vulnerability class: Privilege Escalation

EPSS: 0.003 (16.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Microsoft Edge_chromium
Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

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

Frequently asked questions

What is CVE-2026-21223?: CVE-2026-21223 is a high-severity vulnerability in Microsoft Edge_chromium, classified under Improper Privilege Management. CVSS score: 7.1/10. Published 2026-01-16.
How severe is CVE-2026-21223?: High severity. CVSS v3 base score is 7.1 out of 10.