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

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Summary

CVECVE-2026-46341
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 18:16:43 UTC
Updated2026-07-16 18:16:43 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

Problem Types: CWE-20 | CWE-183 | CWE-20 CWE-20: Improper Input Validation | CWE-183 CWE-183: Permissive List of Allowed Inputs

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apify Apify-mcp-server affected < 0.9.21 Not specified

References

ReferenceSourceLinkTags
github.com/apify/apify-mcp-server/pull/781 [email protected] github.com
github.com/apify/apify-mcp-server/security/advisories/GHSA-jwp7-wg77-3w9v [email protected] github.com
github.com/apify/apify-mcp-server/commit/e39bdee530da1db0b3b3d3713558b33... [email protected] github.com
github.com/apify/apify-mcp-server/releases/tag/v0.9.21 [email protected] github.com
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