Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), and some loss of integrity (I:L), but no loss of availability (A:N). What does that mean for this vulnerability?
An attacker who successfully exploited this vulnerability could view sensitive information, a token in this scenario (Confidentiality), and make some changes to disclosed information (Integrity), but they would not be able to affect Availability.
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An attacker who successfully exploited this vulnerability could bypass the Trusted Domain Service.
Security updates
1.100.1 — https://code.visualstudio.com/updates/v1_100
0.27.2 — https://github.com/microsoft/vscode/
Vulnerabilities 1
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High 7.1
Visual Studio Code Security Feature Bypass Vulnerability
Files or directories accessible to external parties in Visual Studio Code allows an unauthorized attacker to bypass a security feature locally.
Revision history
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#2
In the Security Updates Table, added Microsoft Visual Studio CoPilot Chat Extension as it is also affected by this vulnerability. Microsoft recommends that customers install the update to be fully protected from the vulnerability.
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#1
Information published.
References
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CVE-2025-21264 Visual Studio Code Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21264
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss