Vulnerability Database

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Total vulnerabilities in the database

Claude Code Improper Authorization via websocket connections from arbitrary origins — @anthropic-ai / claude-code

Improper Authorization

Claude Code extensions in VSCode and forks (e.g., Cursor, Windsurf, and VSCodium) and JetBrains IDEs (e.g., IntelliJ, Pycharm, and Android Studio) are vulnerable to unauthorized websocket connections from an attacker when visiting attacker-controlled webpages. Claude Code for VSCode IDE extensions versions 0.2.116 through 1.0.23 are vulnerable. For Jetbrains IDE plugins, Claude Code [beta] versions 0.1.1 through 0.1.8 are vulnerable.

In VSCode (and forks), exploitation would allow an attacker to read arbitrary files, see the list of files open in the IDE, get selection and diagnostics events from the IDE, or execute code in limited situations where a user has an open Jupyter Notebook and accepts a malicious prompt. In JetBrains IDEs, an attacker could get selection events, a list of open files, and a list of syntax errors.

Remediation

We released a patch for this issue on June 13th, 2025. Although Claude Code auto-updates when you launch it and auto-updates the extensions, you should take the following steps (the exact steps depend on your IDE).

VSCode, Cursor, Windsurf, VSCodium, and other VSCode forks Extension Name: Claude Code for VSCode

Instructions:

  1. Open the list of Extensions (View->Extensions)
  2. Look for Claude Code for VSCode among installed extensions
  3. If you have a version < 1.0.24, click “Update” (or “Uninstall”)
  4. Restart the IDE

All JetBrains IDEs including IntelliJ, PyCharm, and Android Studio Plugin name: Claude Code [Beta]

Instructions:

  1. Open the Plugins list
  2. Look for Claude Code [Beta] among installed extensions
  3. Update (or Uninstall) the plugin if the version is < 0.1.9
  4. Restart the IDE
  • Published: Jun 23, 2025
  • Updated: Jun 24, 2025
  • GHSA: GHSA-9f65-56v6-gxw7
  • Severity: High
  • Exploit:
  • CISA KEV:

No technical information available.

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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

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Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

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