HighVulnerabilityLLM-specific

CVE-2026-24052: Claude Code WebFetch trusted domain check bypass via startsWith validation

Source: NVD(opens in a new tab)
Identifier: CVE-2026-24052
Published: February 3, 2026
Record updated: October 9, 2026

Affected: @anthropic-ai/claude-code < 1.0.111
Fixed in: 1.0.111
released September 10, 2025, 146 days before disclosure
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.4%

Summary

CVE-2026-24052 affects Claude Code before version 1.0.111. Its trusted domain check for WebFetch requests used startsWith(), so a domain such as modelcontextprotocol.io.example.com passed validation as if it were modelcontextprotocol.io. This could let an attacker trigger automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration.

Mitigation

Fixed in version 1.0.111.

Details

Scores and exploitation

CVSS score: 7.4(high)
Patch available: Yes
EPSS: 0.4%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.

Weaknesses and techniques

Weakness (CWE): CWE-601

Affected

Packages: @anthropic-ai/claude-code@< 1.0.111 (fixed: 1.0.111)
Vendors: Anthropic

Classification

Attack type: Data extraction
Attack sophistication: Moderate
AI component targeted: Plugin
Impact: Confidentiality
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-24052

First tracked: February 15, 2026 at 08:52 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 95% (self-assessed)

Topics

AI agents

Summary

Mitigation

Topics

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