Summary
Claude Code Improper Authorization via websocket connections from arbitrary origins
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:
- Open the list of Extensions (View->Extensions)
- Look for Claude Code for VSCode among installed extensions
- If you have a version < 1.0.24, click “Update” (or “Uninstall”)
- Restart the IDE
All JetBrains IDEs including IntelliJ, PyCharm, and Android Studio
Plugin name: Claude Code [Beta]
Instructions:
- Open the Plugins list
- Look for Claude Code [Beta] among installed extensions
- Update (or Uninstall) the plugin if the version is < 0.1.9
- Restart the IDE
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2025-52882? CVE-2025-52882 is a high-severity security vulnerability in @anthropic-ai/claude-code (npm), affecting versions >= 0.2.116, < 1.0.24. It is fixed in 1.0.24.
- Which versions of @anthropic-ai/claude-code are affected by CVE-2025-52882? @anthropic-ai/claude-code (npm) versions >= 0.2.116, < 1.0.24 is affected.
- Is there a fix for CVE-2025-52882? Yes. CVE-2025-52882 is fixed in 1.0.24. Upgrade to this version or later.
- Is CVE-2025-52882 exploitable, and should I be worried? Whether CVE-2025-52882 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2025-52882 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2025-52882? Upgrade
@anthropic-ai/claude-codeto 1.0.24 or later.