How broadly exploitable is this vulnerability?

Exploitability depends on how easily an attacker can influence the URLs the tool fetches. In collaborative environments or where users paste untrusted links into the tool, it can be relatively straightforward for an attacker to introduce malicious but deceptively named domains.

Does an attacker need special access or authentication?

Typically, the attacker does not need privileged access to the system running Claude Code; they primarily need a way to cause the tool to fetch from a crafted domain they control. This might occur through user interaction with shared code, prompts, or configuration that references such URLs.

What is the safest general fix pattern?

The safest pattern is to parse each URL and apply strict origin-based validation, comparing normalized hostnames and schemes against a minimal, clearly defined allowlist. Avoid using substring or prefix checks to determine trust, and treat any unrecognized origin as untrusted by default.

Severity:

HIGH RISK

(7.4)

Open Redirect-Style Trusted Domain Bypass (CWE-601) in Claude Code WebFetch Validation

CVE-2026-24052

Published:

Feb 3, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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CRITICAL RISK

CRITICAL

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Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Improper URL/Domain Validation

CWE:

CWE-601

Impact:

Data Exfiltration via Misvalidated Trusted Domains

Severity:

HIGH RISK

(7.4)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper URL/Domain Validation

CWE:

CWE-601

Impact:

Data Exfiltration via Misvalidated Trusted Domains

Severity:

HIGH RISK

(7.4)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Open Redirect-Style Trusted Domain Bypass (CWE-601) in Claude Code WebFetch Validation

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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