apify MCP Server up to 0.9.20 Domain Validation fetch_apify_docs.ts startsWith input validation

Summaryinfo

A vulnerability classified as critical has been found in apify MCP Server up to 0.9.20. The impacted element is the function startsWith of the file src/tools/common/fetch_apify_docs.ts of the component Domain Validation. The manipulation leads to input validation. This vulnerability is referenced as CVE-2026-46341. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in apify MCP Server up to 0.9.20. This issue affects the function startsWith of the file src/tools/common/fetch_apify_docs.ts of the component Domain Validation. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-46341 since 05/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.9.21 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• apify

Name

• MCP Server

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10
• 0.9.11
• 0.9.12
• 0.9.13
• 0.9.14
• 0.9.15
• 0.9.16
• 0.9.17
• 0.9.18
• 0.9.19
• 0.9.20

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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