Ref# ADV2025_406 | Date: Dec 8th 2025

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Microsoft Edge published a security advisory highlighting vulnerabilities in the following product on December 4th, 2025. It is recommended that you take the necessary precautions by ensuring your product is always updated. 

• Microsoft Edge Stable Channel – versions prior to 143.0.3650.66 

For more information on this update, you can follow this URL: 

• Microsoft Edge Stable Channel Release Notes 

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

References 

• Microsoft Edge Security Advisory (December 4th, 2025). Retrieved from Microsoft Edge. https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security#december-4-2025 

  

• Microsoft Edge Security Advisory. (December 5th, 2025). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/microsoft-edge-security-advisory-av25-810