CVE-2026-57983 is a high severity flaw (CVSS 8.7) in Microsoft Edge (Chromium-based). Improper authorization lets an unauthorized attacker bypass a security feature over a network. The record names no fixed build, so update Edge to the latest release and read the Microsoft guide.
What's affected
- Microsoft Edge (Chromium-based). The record does not list version ranges.
- Fixed build: not stated in the record. The MSRC update guide lists it.
How to check if you're exposed
Open edge://settings/help. Edge checks for updates and shows the installed version. Compare it with the fixed build in the MSRC update guide for this CVE. Managed fleets can read the version from device management reports.
Client software like this is tracked by your endpoint tools, not by a code scan, but the Gold directory is a quick way to look up the CVE record and its weakness class when you write the change ticket.
What to do now
- Open the MSRC guide for this CVE and note the fixed build.
- Update Edge on all managed devices and restart the browser.
- Confirm the new version through your endpoint management tool.
After updating, confirm the new build on a sample of devices and then look for stragglers in your management console. Devices that were offline or switched off during the rollout tend to be the last ones patched.
Why it matters
The record classes this as CWE-285 (Improper Authorization). A check that decides whether an action is allowed does not hold. The record says little else, so this post does not guess at the exact feature.
The CISA KEV flag is false.
Browsers update often, so the real risk in a fleet is the share of machines that have not restarted. A weekly report of the oldest browser build on the network is a cheap control.
Quick check
Does a restart matter?
Yes. Edge applies updates when restarted, so an open window may still run the old version.
Sources
Last reviewed: 19 October 2026.
