CVE-2026-56646 edge chromium vulnerability
Exposure of sensitive information to an unauthorized actor in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing 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
- before 150.0.4078.48
Fixed versions
- 150.0.4078.48
How to fix it
CVE-2026-56646 affects Microsoft Edge Chromium. It may let an attacker trick users with spoofed content. Update Edge to 150.0.4078.48 or newer, then confirm all managed devices received the update.
- List every device that has Microsoft Edge Chromium installed.
- Check the installed Edge version and compare it with 150.0.4078.48.
- Update Edge to 150.0.4078.48 or a newer supported build from Microsoft.
- Restart Edge and any app that uses the Edge browser engine.
- Keep browser auto updates on for all users.
- Limit risky browsing on devices that are not patched yet.
- Review browser, proxy, EDR, and sign-in logs for strange activity.
- If abuse is suspected, isolate the device and rotate exposed passwords.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm Edge shows version 150.0.4078.48 or newer.
- Confirm update policies are active for all managed devices.
- Check that no device still runs an older Edge build.
- Retest any workflow that depends on Edge or WebView.
- Save the version check and log review as evidence.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-56646?
microsoft edge chromium versions listed as affected should be reviewed: before 150.0.4078.48.
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.