CVE-2026-46341

MEDIUM 6.1

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

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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://[email protected]/` to pass the ALLOWED_DOC_DOMAINS check and return arbitrary fetched content to the LLM. This issue is fixed in version 0.9.21.

CWE	CWE-20 CWE-183
Vendor	apify
Product	apify-mcp-server
Published	Jul 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

apify / apify-mcp-server

< 0.9.21

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/apify/apify-mcp-server/security/advisories/GHSA-jwp7-wg77-3w9v github.com: https://github.com/apify/apify-mcp-server/pull/781 github.com: https://github.com/apify/apify-mcp-server/commit/e39bdee530da1db0b3b3d3713558b33c9608e629 github.com: https://github.com/apify/apify-mcp-server/releases/tag/v0.9.21