CVE-2026-50521 in Microsoft Edge Chromium
Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
Quick answer
Microsoft Edge Chromium should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Microsoft Edge Chromium before 149.0.4022.68
Fixed versions
- Microsoft Edge Chromium 149.0.4022.68 or later
How to fix it
CVE-2026-50521 affects Microsoft Edge Chromium. The issue means the affected software may be abused in a way that breaks security controls. Treat it as a priority if this software is reachable by users, admins, browsers, or the network. Update to Microsoft Edge Chromium 149.0.4022.68 or later, or follow the linked vendor advisory if your branch needs a backport.
- Inventory every Microsoft Edge Chromium install, package, server, browser, or managed device in use.
- Compare installed versions with the affected range: Microsoft Edge Chromium before 149.0.4022.68.
- Update to Microsoft Edge Chromium 149.0.4022.68 or later.
- If you cannot update today, restrict access to trusted users and trusted networks only.
- Review logs for crashes, failed requests, privilege changes, unusual data access, or exploit alerts.
- Rotate secrets, tokens, and passwords if exposure or abuse is suspected.
- Document the update and keep the advisory link with the change record.
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Verify the fix
- Confirm the installed version matches the fixed guidance: Microsoft Edge Chromium 149.0.4022.68 or later.
- Confirm risky admin, API, browser, or network exposure is reduced.
- Retest the affected workflow after the update or mitigation.
- Review logs again after patching for repeated suspicious activity.
- Run a new Fixnx scan where the affected software is part of the public site.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-50521?
Microsoft Edge Chromium versions listed as affected should be reviewed: Microsoft Edge Chromium before 149.0.4022.68.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.