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Actor MCP path authority injection leaks Apify token

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-50143
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 06:52 UTC · Revision 1

Source evidence

Actor MCP path authority injection leaks Apify token

core-osv · Original source

Published 18 Aug 2026, 17:51 UTC

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.

osv:CVE-2026-50143
Complete source record
{
  "id": "4b6f658801ff523dd33d221764b2bbc4c478fbb8361ac334f128d4bd6218ee2b",
  "url": "https://osv.dev/vulnerability/CVE-2026-50143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Actor MCP path authority injection leaks Apify token",
    "summary": "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.",
    "evidence": "osv:CVE-2026-50143",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-50143",
      "aliases": [
        "CVE-2026-50143",
        "GHSA-6gr2-qh89-hxwm"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apify/apify-mcp-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7e054ac43c9258a78741f44c2ae2fb9c32336b4f"
                },
                {
                  "fixed": "ef686d77da3d3c86c30b2ae24218d756aa38e09c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.10.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ef686d77da3d3c86c30b2ae24218d756aa38e09c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7e054ac43c9258a78741f44c2ae2fb9c32336b4f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.10.11"
                  }
                ]
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          ],
          "versions": [
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50143.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.988646678Z",
      "provider": "osv",
      "references": [
        "https://github.com/apify/apify-mcp-server/releases/tag/v0.10.11",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50143.json",
        "https://github.com/apify/apify-mcp-server/security/advisories/GHSA-6gr2-qh89-hxwm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50143",
        "https://github.com/apify/apify-mcp-server/commit/ef686d77da3d3c86c30b2ae24218d756aa38e09c",
        "https://github.com/apify/apify-mcp-server/pull/927"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50143.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-50143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518553,
  "published_at": "2026-08-18T17:51:18.888+00:00"
}