Is this vulnerability remotely exploitable?

It is indirectly remote. An attacker typically must convince a developer to open and interact with a crafted HTML page in Live Server, often delivered via a malicious repository, attachment, or shared project. Once the page is open and scripts run, file exfiltration can happen over the network.

What level of access does an attacker need?

The attacker does not need direct access to the victim's machine or editor. They need the ability to supply or influence HTML/JavaScript content that the victim opens through Live Server. The extension and browser then bridge the gap to local files.

What is the safest general fix pattern?

The safest pattern is to ensure that untrusted content cannot execute powerful scripts in a context that exposes sensitive local files. Practically, this means strictly scoping what files are served, isolating untrusted projects, and treating the local dev server as an untrusted boundary that must not leak secrets.

Severity:

CRITICAL RISK

(9.1)

File Exfiltration via HTML-Driven XSS (CWE-79) in VS Code Live Server Extension

CVE-2025-65717

Published:

Feb 16, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS) and Data Exposure

CWE:

CWE-79;CWE-200;CWE-601

Impact:

Sensitive File Exfiltration from Developer Workstation

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS) and Data Exposure

CWE:

CWE-79;CWE-200;CWE-601

Impact:

Sensitive File Exfiltration from Developer Workstation

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

File Exfiltration via HTML-Driven XSS (CWE-79) in VS Code Live Server Extension

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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