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.
History

Tue, 03 Feb 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains
Weaknesses CWE-601
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-03T20:49:41.997Z

Reserved: 2026-01-20T22:30:11.778Z

Link: CVE-2026-24052

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-03T21:16:13.073

Modified: 2026-02-03T21:16:13.073

Link: CVE-2026-24052

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.