Microsoft Edge Security Updates – August 2025

Microsoft Edge security updates are released to resolve security vulnerabilities in the underlying Chromium browser engine.

We look at the security updates for Edge browser released by Microsoft in August. The information below is suitable for Edge installations on Windows computers or Windows operating systems.

The latest version of Edge browser for Windows is 139.0.3405.125. The last update was released on 28 August 2025.

Essential points

• Edge browser stable channel is now on build 139. Until July, Edge worked on build 138.
• In August, we have had 4 iterations of the security updates for the Edge browser. Edge updates were rolled out on 7, 14, 21 and 28 August 2025. The last one being a CRITICAL security update.
• On 28 August, a CRITICAL security vulnerability in the Chromium browser engine was fixed in the security update for Edge build number 139.0.3405.125.
• On 21 August, the latest security update was released to address single HIGH security vulnerability.
• As of 25 August, we have had 3 security updates for the Edge browser in August 2025.
• The initial security update was released on 7 August 2025 wherein the stable channel version for Edge was Version 139.0.3405.86. It resolved 12 security vulnerabilities. 8 of these security vulnerabilities are publicly disclosed and patched in the build version 139.0.3405.86.
• On 15 August 2025, a new iteration or a new security update for Edge browser was released. It pushed the stable channel version for Edge to Version 139.0.3405.102. It resolved 5 security vulnerabilities. 5 of these security vulnerabilities are publicly disclosed and patched in the build version 139.0.3405.102.

Security Vulnerabilities – Edge update

The security update for 28 August resolves a Chromium vulnerability with CRITICAL severity. The security vulnerability is listed below.

• CVE-2025-9478: Use after free in ANGLE.

The security update for 21 August 2025 resolves a single security vulnerability reported by the Chromium project.

• CVE-2025-9132 – HIGH severity – Out of bounds write in V8

The security update for 15 August 2025 resolved the following 5 security vulnerabilities reported by the Chromium project:

• CVE-2025-8879 – HIGH Severity – Heap buffer overflow in libaom
• CVE-2025-8880 – HIGH Severity – Race in V8
• CVE-2025-8881 _ Medium Severity – Inappropriate implementation in File Picker
• CVE-2025-8882 – Medium Severity – Use after free in Aura
• CVE-2025-8901 – HIGH Severity – Out of bounds write in ANGLE

The latest security update does report 3 HIGH severity vulnerabilties. Therefore, it is important to update Edge to the latest build at your earliest convenience.

The security update for 7 August 2025 resolved the following security vulnerabilities reported by the Chromium project:

• CVE-2025-8576 – Medium Severity – Use after free in Extensions
• CVE-2025-8577 – Medium Severity – Inappropriate implementation in Picture In Picture.
• CVE-2025-8578 – Medium Severity – Use after free in Cast
• CVE-2025-8579 – Low Severity – Inappropriate implementation in Gemini Live in Chrome
• CVE-2025-8580 – Low Severity – Inappropriate implementation in Filesystems
• CVE-2025-8581 – Low Severity – Inappropriate implementation in Extensions.
• CVE-2025-8582 – Low Severity – Insufficient validation of untrusted input in DOM
• CVE-2025-8583 – Low Severity – Inappropriate implementation in Permissions.

How to find the current Edge version on your computer?

The easiest way is to open Edge browser on the system and use the following reg expression:

reg query HKCU\Software\Microsoft\Edge\BLBeacon /v version

You could use the Powershell command to find Edge version on a local or remote computer:

(Get-ItemProperty -Path HKCU:\Software\Microsoft\Edge\BLBeacon -Name version).version

If you do not have Powershell loaded, you can use the console command:

wmic datafile where 'name="C:\\Program Files (x86)\\Microsoft\\Edge Dev\\Application\\msedge.exe"' get Version