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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (18.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Microsoft Edge Chromium
- Microsoft Edge (Chromium-Based) — versions 1.0.0.0
Weakness classification (CWE)
References
- Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability (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.