CVE-2025-24042: Visual Studio Code Privilege Escalation

CVE-2025-24042 Overview

CVE-2025-24042 is an elevation of privilege vulnerability in the Visual Studio Code JavaScript Debug Extension. Microsoft published the advisory on February 11, 2025. The flaw is categorized under [CWE-284] Improper Access Control and allows a local, authenticated attacker to gain higher privileges on an affected host when a user interacts with a malicious debug session or workspace.

The vulnerability affects Microsoft Visual Studio Code installations that ship the JS Debug extension. Exploitation requires local access and user interaction, but successful attacks yield high impact to confidentiality, integrity, and availability of the target system.

Critical Impact
A local attacker who tricks a developer into launching a crafted debug configuration can escalate privileges within the Visual Studio Code process context and execute code with the victim's rights.

Affected Products

Microsoft Visual Studio Code (JS Debug extension)
Visual Studio Code installations bundling the vulnerable vscode-js-debug component
Downstream distributions embedding the affected extension version

Discovery Timeline

2025-02-11 - Microsoft publishes advisory for CVE-2025-24042
2025-02-11 - CVE-2025-24042 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-24042

Vulnerability Analysis

The flaw resides in the JavaScript Debug Extension shipped with Visual Studio Code. Microsoft classifies the issue as an elevation of privilege condition rooted in improper access control [CWE-284]. The extension exposes debug session functionality that, under specific conditions, fails to properly restrict actions available to a lower-privileged local user.

When a victim opens a crafted workspace or accepts a malicious debug configuration, the extension can perform operations with privileges beyond what the invoking user should hold within the editor's process context. This creates a pathway for local privilege escalation on multi-user systems and shared development hosts.

Exploitation requires user interaction, which limits opportunistic attacks. However, developers routinely open shared repositories, cloned projects, and workspace files supplied by third parties, making social engineering a realistic delivery mechanism.

Root Cause

The root cause is improper access control within the JS Debug extension's handling of debug session operations. The extension does not adequately validate the authorization boundary between the invoking user's context and the actions performed on their behalf. Microsoft has not published component-level source details, but the CWE-284 classification indicates missing or insufficient permission checks along a trust boundary.

Attack Vector

The attack vector is local. An attacker needs the ability to run code or supply content on the target machine, along with the ability to persuade a legitimate user to trigger a debug session. Typical delivery paths include malicious launch.json files inside cloned repositories, crafted workspace folders, or trojanized project templates.

Once the victim initiates the debug session, the extension performs privileged actions that the attacker's context should not have been able to invoke, resulting in elevation of privilege. Refer to the Microsoft CVE-2025-24042 Advisory for vendor guidance.

Detection Methods for CVE-2025-24042

Indicators of Compromise

Unexpected creation or modification of .vscode/launch.json files inside untrusted repositories
Debug adapter child processes spawned by Code.exe executing shells, script interpreters, or binaries outside the project directory
Anomalous file writes or registry modifications occurring during Visual Studio Code debug sessions
Outbound network connections from vscode-js-debug worker processes to unfamiliar hosts

Detection Strategies

Monitor process lineage for Visual Studio Code spawning unexpected child processes through the JS Debug extension
Alert on modifications to VS Code extension directories and workspace trust configuration files
Correlate opening of newly cloned repositories with subsequent privileged operations on the host

Monitoring Recommendations

Enable endpoint process telemetry that captures command lines for node.exe and debug adapter processes launched by Visual Studio Code
Track installation and version state of the JS Debug extension across developer endpoints using software inventory tooling
Review Visual Studio Code workspace trust prompts and audit which repositories developers have marked as trusted

How to Mitigate CVE-2025-24042

Immediate Actions Required

Update Visual Studio Code and the bundled JS Debug extension to the fixed versions referenced in the Microsoft CVE-2025-24042 Advisory
Enforce Workspace Trust in Visual Studio Code so untrusted folders cannot execute debug configurations automatically
Audit developer endpoints for the installed version of vscode-js-debug and prioritize patching for shared or multi-user hosts

Patch Information

Microsoft addressed CVE-2025-24042 through updates delivered via the standard Visual Studio Code update channel and the JS Debug extension marketplace listing. Administrators should confirm that both the editor and the extension have been updated, since extensions update independently of the base editor. Consult the Microsoft CVE-2025-24042 Advisory for the specific fixed versions.

Workarounds

Disable the JS Debug extension on hosts that do not require JavaScript or TypeScript debugging until patching is complete
Instruct developers to avoid opening untrusted repositories and to review launch.json contents before starting debug sessions
Use Workspace Trust to restrict automatic execution of tasks and debug configurations from unverified sources

bash

# Verify installed JS Debug extension version and update Visual Studio Code
code --list-extensions --show-versions | grep js-debug
code --install-extension ms-vscode.js-debug --force