CVE-2026-24052
HIGH
GHSA-vhw5-3g5m-8ggf
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Lifecycle Timeline
3Tags
Description
Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.
Analysis
Claude Code versions prior to 1.0.111 fail to properly validate trusted domains for WebFetch requests, allowing attackers to register lookalike domains (e.g., modelcontextprotocol.io.example.com) that bypass validation checks. This enables unauthorized automated requests to attacker-controlled servers without user interaction, potentially resulting in sensitive data exfiltration from the user's environment. …
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Remediation
Within 24 hours: Identify all Claude Code installations and their versions across your organization. Within 7 days: Implement network segmentation to restrict Claude Code's outbound access to only verified, necessary domains, and disable WebFetch functionality if not operationally critical. …
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External POC / Exploit Code
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