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Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M

CVE-2026-46341Apify MCP server: Domain Allowlist Bypass in fetch-apify-docs via String Prefix Matching

Medium 6.1

In plain English

A medium-severity improper input validation in apify-mcp-server from apify. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 85.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

The Apify MCP server enables AI agents to extract data from websites using ready-made scrapers, crawlers, and automation tools available on the Apify Store. Prior to 0.9.21, the fetch-apify-docs tool in src/tools/common/fetch_apify_docs.ts validates allowlisted documentation domains with String.startsWith() rather than URL hostname comparison, allowing attacker-controlled URLs such as `https://docs.apify.com.evil.com/` and `https://docs.apify.com@evil.com/` to pass the ALLOWED_DOC_DOMAINS check and return arbitrary fetched content to the LLM. This issue is fixed in version 0.9.21.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@apify/actors-mcp-server0.9.21GHSA-jwp7-wg77-3w9v

Affected products (as reported)

VendorProductVersions
apify apify-mcp-server < 0.9.21

Weakness: CWE-20, CWE-183 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References