Chromium CVE-2026-121136: Missing authorization

What could go wrong?

Microsoft fixed a security weakness. Details are limited to avoid helping attackers.

How urgent is it?

Check Microsoft’s page for details.

Who is affected?

Microsoft Edge (Chromium-based)

What should I do?

Install this month’s updates via Windows Update, Intune or your update tool, then restart.

Known problems

Microsoft lists known issues per update: no KB article listed. Official page.