What’s Vulnerable › Vulnerabilities
CVE-2025-55284: Claude Code's Permissive Default Allowlist Enables Unauthorized File Read and Network Exfiltration in Claude Code
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-08-16 · updated 2026-06-17
- Weakness: CWE-78
Description
Claude Code is an agentic coding tool. Prior to version 1.0.4, it's possible to bypass the Claude Code confirmation prompts to read a file and then send file contents over the network without user confirmation due to an overly broad allowlist of safe commands. Reliably exploiting this requires the ability to add untrusted content into a Claude Code context window. Users on standard Claude Code auto-update received this fix automatically after release. Current users of Claude Code are unaffected, as versions prior to 1.0.24 are deprecated and have been forced to update.
Affected products
- anthropics claude-code: before 1.0.4 — fixed in 1.0.4
How to fix
Upgrade to a fixed version: anthropics claude-code 1.0.4. Check the vendor advisory for mitigations.
References
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