Ref# ADV2025_329 | Date: Sep 23rd 2025

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Microsoft Edge has published a security advisory highlighting vulnerabilities in the following product on September 19th, 2025. It is recommended that you take the necessary precautions by ensuring your products are always updated. 

• Microsoft Edge Stable Channel – versions prior to 140.0.3485.81 

For more information on this update, you can follow this URL:
https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security#september-19-2025 

The Guyana National CIRT recommends that users and administrators review this update and apply it where necessary. 

PDF Download: Microsoft Edge Security Advisory

References 

• Microsoft Edge security advisory. (November 22nd, 2025). Retrieved from Canadian Centre for Cyber Security.
  https://www.cyber.gc.ca/en/alerts-advisories/microsoft-edge-security-advisory-av25-611 

 

• Release notes for Microsoft Edge Security Updates. (November 19, 2025). Retrieved from Microsoft Ignite.
  https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security#september-19-2025