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OpenAdvisories
High · 8.1 CVE-2026-50143 EUVD-2026-61136GHSA-6gr2-qh89-hxwm

Actor MCP path authority injection leaks Apify token

Published Aug 18, 2026 · Updated Aug 18, 2026 · Assigned by GitHub_M

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 0.10.11, getActorMCPServerURL in src/mcp/actors.ts concatenates the trusted Actor standby URL with the attacker-controlled webServerMcpPath from an Actor definition without verifying the resulting origin, allowing a malicious Actor publisher to use a userinfo-style authority value to redirect connectMCPClient to a third-party host. The call-actor, fetch-actor-details, and actor-mcp tool-loading paths pass this URL to transports in src/mcp/client.ts that attach the victim Authorization bearer token, exposing the Apify API token and enabling access to Actors, stored data, and billable compute. A victim must invoke or inspect the attacker-controlled Actor. This issue is fixed in version 0.10.11.

Affected products

VendorProductAffectedFixed
apify apify-mcp-server < 0.10.11 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @apify/actors-mcp-server < 0.10.11 0.10.11 GHSA-6gr2-qh89-hxwm

References