CVE-2026-46341: Apify Model Context Protocol (MCP) server: Domain Allowlist Bypass in fetch-apify-docs via String Prefix Matching

May 19, 2026

The fetch-apify-docs tool validates URLs against a domain allowlist using String.startsWith() instead of proper URL hostname comparison. This allows bypass via attacker-controlled subdomains (e.g., https://docs.apify.com.evil.com/), enabling the tool to fetch and return arbitrary web content to the LLM.

References

github.com/advisories/GHSA-jwp7-wg77-3w9v
github.com/apify/apify-mcp-server/security/advisories/GHSA-jwp7-wg77-3w9v
nvd.nist.gov/vuln/detail/CVE-2026-46341

Code Behaviors & Features

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