Summary
Claude Code Vulnerable to Arbitrary Code Execution Due to Insufficient Startup Warning
When Claude Code was started in a new directory, it displayed a warning asking, "Do you trust the files in this folder?". This warning did not properly document that selecting "Yes, proceed" would allow Claude Code to execute files in the folder without additional confirmation. This may not have been clear to a user so we have updated the warning to clarify this functionality.
Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.
Thank you to https://hackerone.com/avivdon for reporting this issue!
Impact
Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.
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 GHSA-PH6W-F82W-28W6? GHSA-PH6W-F82W-28W6 is a high-severity code injection vulnerability in @anthropic-ai/claude-code (npm), affecting versions < 1.0.87. It is fixed in 1.0.87. Untrusted input is evaluated as executable code within the application's runtime environment.
- Which versions of @anthropic-ai/claude-code are affected by GHSA-PH6W-F82W-28W6? @anthropic-ai/claude-code (npm) versions < 1.0.87 is affected.
- Is there a fix for GHSA-PH6W-F82W-28W6? Yes. GHSA-PH6W-F82W-28W6 is fixed in 1.0.87. Upgrade to this version or later.
- Is GHSA-PH6W-F82W-28W6 exploitable, and should I be worried? Whether GHSA-PH6W-F82W-28W6 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 GHSA-PH6W-F82W-28W6 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 GHSA-PH6W-F82W-28W6? Upgrade
@anthropic-ai/claude-codeto 1.0.87 or later.