Microsoft releases weekly security updates for the Edge browser. On this page, you can check all the security updates released for Microsoft Edge browser in September.
As of 15 September 2025, the latest Edge version is 140.0.3485.66. The last security update for Edge was rolled out on 11 September. There have been two security updates for Edge in September so far. The first update for Edge was released on 5 September and it was followed up with the latest security update on 11 September.
Edge security update – 11 September 2025
Microsoft rolled out the 2nd security update for September 2025 on 11 September. This update focuses on resolving 2 security vulnerabilities reported earlier in the underlying Chromium browser engine.
The latest Edge security update for Windows stable channel pushes the Edge version to the latest 140.0.3485.66.
Of these 2 security vulnerabilities, one is a CRITICAL vulnerability requiring immediate consideration.
The security vulnerabilities resolved in Edge version 140.0.3485.66 are shared hereunder:
- CVE-2025-10200 – Critical Severity – Use after free in Serviceworker
- CVE-2025-10201 – High – Inappropriate implementation in Mojo
Edge security update – 5 September 2025
The first security update for Microsoft Edge for September 2025 was released on 5 September 2025. It primarily caters to fixing the reported security vulnerabilities in the underlying Chromium browser engine.
We look at Edge’s first update for September 2025 below.
- Microsoft Edge is now on build 140. In August, Edge was maintained on the build 139.
- For Windows operating system, Edge’s first security update for September 2025, pushes the latest version to Version 140.0.3485.54.
- Apart from fixing the Chrome engine security vulnerabilities, Edge also fixes a security vulnerability specific to Microsoft.
- Edge version 140.0.3485.54 addresses 6 security vulnerabilities in the Chromium browser engine. 4 of these security vulnerabilities are publicly disclosed. Details of publicly shared security vulnerabilities are shared below.
Edge 140.0.3485.54 – Security vulnerabilities – Chrome project
Edge 140.0.3485.54 was released on 5 September 2025. It is the first security update for the Chrome browser for the month of September. It implements security fixes in the underlying Chromium browser engine and a single Microsoft specific vulnerability.
The current build resolves 6 security vulnerabilities. 4 of these vulnerabilities are publilcy shared by the Chromium team.
The 4 security vulnerabilities reported fixed by the Chrome developers are:
- CVE-2025-9864 – HIGH severity – Use after free in V8
- CVE-2025-9865 – MEDIUM seveirty – Inappropriate implementation in Toolbar
- CVE-2025-9866 – MEDIUM – Inappropriate implementation in Extensions.
- CVE-2025-9867 – MEDIUM – Inappropriate implementation in Downloads
Edge 140.0.3485.54 – Security vulnerabilities – Microsoft
The Microsoft specific security vulnerability in Edge browser that gets fixed in Edge 140.0.3485.54 is listed below:
- CVE-2025-53791 – Security Feature Bypass Vulnerability – MODERATE severity
The latest Edge build is being rolled out to Windows systems in a phased manner. To force an update of Edge browser on your computer, you can close the browser. Re-launch the browser. At the time of re launch, the browser will automatically pull the latest version from the servers.
To check the version of Edge on your Windows computer, you can type the following command in the browser’s address bar:
edge://browser
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