CVE-2026-50143 PUBLISHED

Actor MCP path authority injection leaks Apify token

Assigner: GitHub_M
Reserved: 03.06.2026 Published: 18.08.2026 Updated: 18.08.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS Score: 8.1

Product Status

Vendor apify
Product apify-mcp-server
Versions
  • Version < 0.10.11 is affected

References

Problem Types

  • CWE-918: Server-Side Request Forgery (SSRF) CWE