CVE-2026-102851 Overview
CVE-2026-102851 is a medium-severity security feature bypass in Microsoft Visual Studio Code. The vulnerability stems from incorrect privilege assignment [CWE-266] that allows an authorized local attacker to bypass a security feature. Exploitation requires local access, low privileges, and user interaction, but the scope changes once triggered. The flaw affects integrity of the host where Visual Studio Code is installed.
Critical Impact
An authorized local attacker can bypass a Visual Studio Code security feature, enabling scope change and high integrity impact on the affected system.
Affected Products
- Microsoft Visual Studio Code
Discovery Timeline
- 2026-10-13 - CVE-2026-102851 published to the National Vulnerability Database (NVD)
- 2026-10-13 - Last updated in NVD database
Technical Details for CVE-2026-102851
Vulnerability Analysis
The vulnerability is categorized under CWE-266: Incorrect Privilege Assignment. Visual Studio Code assigns privileges to a component or operation that exceed the privileges intended by the application's security model. An authorized local user can leverage this misassignment to bypass a security feature that should otherwise restrict the action.
Exploitation occurs over a local attack vector and requires user interaction. The scope is changed, meaning the impact extends beyond the vulnerable component itself. Confidentiality impact is limited, integrity impact is high, and availability is unaffected.
Root Cause
The root cause is improper privilege assignment within Visual Studio Code. A code path grants a privilege level that does not match the intended trust boundary, allowing the attacker to perform an action that the security feature should block. Microsoft has not published granular technical details beyond the advisory.
Attack Vector
An attacker with low-privileged local access to a system running Visual Studio Code must induce a user to interact with crafted content or configuration. Successful exploitation produces high integrity impact across a changed scope, meaning files or components outside the editor's intended trust boundary may be modified. See the Microsoft Security Update Guide CVE-2026-102851 for additional context.
No public proof-of-concept exploit, exploit database entry, or in-the-wild exploitation has been reported for this CVE at the time of publication.
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Stop Identity AttacksDetection Methods for CVE-2026-102851
Indicators of Compromise
- Visual Studio Code processes writing to or modifying files outside the active workspace or user profile.
- Unexpected creation or modification of VS Code extensions, settings, or tasks.json and launch.json files.
- Child processes spawned by Code.exe performing privileged file or registry operations.
Detection Strategies
- Monitor Visual Studio Code child-process trees for execution of shells, scripts, or system binaries that deviate from developer baselines.
- Audit extension installation events and workspace trust prompts for anomalous acceptance patterns.
- Correlate local user sessions with file integrity events in developer directories.
Monitoring Recommendations
- Enable endpoint telemetry for process creation, file modification, and command-line arguments associated with Code.exe.
- Alert on Visual Studio Code writing to system directories or auto-start locations.
- Track installed extension inventories across endpoints and flag unapproved publishers.
How to Mitigate CVE-2026-102851
Immediate Actions Required
- Apply the Microsoft-provided update for Visual Studio Code referenced in the Microsoft Security Update Guide CVE-2026-102851.
- Enforce Workspace Trust in Visual Studio Code and require explicit approval for untrusted folders.
- Restrict installation of third-party extensions to a vetted allowlist.
Patch Information
Microsoft has issued an advisory for CVE-2026-102851 through the Microsoft Security Response Center. Administrators should consult the Microsoft Security Update Guide CVE-2026-102851 for the current fixed build numbers and apply updates through standard Visual Studio Code update channels or managed deployment tooling.
Workarounds
- Disable automatic opening of recently used workspaces until the patch is applied.
- Run Visual Studio Code as a standard, non-administrative user to limit the blast radius of any bypass.
- Avoid opening repositories, folders, or files from untrusted sources on affected systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
