Multiple vulnerabilities in Microsoft Browser

Description

Multiple vulnerabilities were found in Microsoft Browser. Malicious users can exploit these vulnerabilities to execute arbitrary code, bypass security restrictions, spoof user interface.

Below is a complete list of vulnerabilities:

1. Use after free vulnerability in V8 can be exploited remotely to execute arbitrary code
2. Inappropriate implementation vulnerability in Extensions can be exploited to bypass security restrictions.
3. Inappropriate implementation vulnerability in Downloads can be exploited to spoof user interface.
4. Inappropriate implementation vulnerability in Toolbar can be exploited to spoof user interface.
5. A security feature bypass vulnerability in Microsoft Edge (Chromium-based) can be exploited remotely to bypass security restrictions.

Original advisories

• CVE-2025-9864

• CVE-2025-9866
• CVE-2025-9867
• CVE-2025-9865
• CVE-2025-53791

Exploitation

Public exploits exist for this vulnerability.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Related products

• Microsoft-Edge

CVE list

• CVE-2025-9864
  unknown
• CVE-2025-9865
  high
• CVE-2025-9866
  critical
• CVE-2025-9867
  high
• CVE-2025-53791
  warning

KB list

Read more

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