503593 – Microsoft Edge: Adding protection against malicious sideloaded extensions

Product:

Microsoft Edge

Platform:

Web, World tenant

Status:

In development

Change type:

Links:

Details:

Microsoft Edge will detect and revoke malicious sideloaded extensions.

Change Category:
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Scope:
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Release Phase:
General Availability

Created:
2025-09-26

updated:
2025-12-03

Docu to Check

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MS workload name

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summary for non-techies**

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Direct effects for Operations**

Malicious Extension Detection Failure
If the change is implemented without proper preparation, users may experience security vulnerabilities due to undetected malicious extensions, leading to data breaches or loss of sensitive information.
   - roles: IT Security Manager, End User
   - references: https://www.microsoft.com/en-us/security/blog/2021/06/15/microsoft-edge-adding-protection-against-malicious-sideloaded-extensions/

User Experience Disruption
Users may face interruptions or degraded performance if malicious extensions are revoked unexpectedly, leading to frustration and decreased productivity.
   - roles: End User, Help Desk Support
   - references: https://www.microsoft.com/en-us/security/blog/2021/06/15/microsoft-edge-adding-protection-against-malicious-sideloaded-extensions/

Increased Support Tickets
The sudden revocation of extensions could lead to a spike in support tickets as users seek assistance with missing functionalities, overwhelming the IT support team.
   - roles: Help Desk Support, IT Operations Manager
   - references: https://www.microsoft.com/en-us/security/blog/2021/06/15/microsoft-edge-adding-protection-against-malicious-sideloaded-extensions/

Configutation Options**

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Opportunities**

Enhanced Security Awareness Training
With the introduction of protection against malicious sideloaded extensions, there is an opportunity to enhance security awareness training for employees. This can include educating users on the risks associated with sideloaded extensions and promoting safe browsing practices.
   - next-steps: Develop a training module focusing on browser security and the importance of using trusted extensions. Schedule regular training sessions and assessments to ensure understanding and compliance.
   - roles: IT Security Team, HR Training Department, All Employees
   - references: https://www.microsoft.com/en-us/security/blog/2023/10/01/understanding-browser-security-and-sideloaded-extensions/

Implementation of Extension Whitelisting
By leveraging the new detection capabilities, organizations can implement an extension whitelisting policy. This will ensure that only approved extensions are allowed, reducing the risk of malicious software and improving overall security posture.
   - next-steps: Evaluate current extensions in use and create a whitelist of approved extensions. Implement policies to restrict the installation of unapproved extensions and monitor compliance.
   - roles: IT Administrators, Compliance Officers, Security Officers
   - references: https://www.techrepublic.com/article/how-to-create-an-extension-whitelist-in-microsoft-edge/

Improved Incident Response Protocols
The detection and revocation of malicious extensions provide an opportunity to enhance incident response protocols. Organizations can develop a more robust response plan for when malicious extensions are detected, ensuring quick action to mitigate risks.
   - next-steps: Review current incident response protocols and integrate steps for handling detected malicious extensions. Conduct tabletop exercises to test and refine the updated protocols.
   - roles: IT Security Team, Incident Response Team, IT Management
   - references: https://www.csoonline.com/article/3671357/how-to-improve-your-incident-response-plan.html

Potentional Risks**

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IT Security**

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explanation for non-techies**

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