CVE-2026-48039: Pipeboard-Co Meta-Ads-Mcp

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Meta Ads MCP is a Model Context Protocol (MCP) server that lets AI assistants run Meta Ads. Prior to version 1.0.109, `AuthInjectionMiddleware.dispatch()` at `http_auth_integration.py:272` unconditionally forwards unauthenticated Streamable HTTP requests to downstream MCP tool handlers without issuing a `401` response, allowing any network-reachable caller to invoke MCP tools without authentication. When no per-request credential is present, tool handlers fall back to the `META_ACCESS_TOKEN` environment variable, and when the downstream Meta Graph API call fails, `api.py:263–269` serialises the raw `httpx` request URL—including the operator's `access_token` as a query parameter—into the JSON-RPC response body, delivering the credential to the unauthenticated caller. Version 1.0.109 fixes the issue.

Affected products

• Pipeboard-Co Meta-Ads-Mcp: before 1.0.109 (fixed in 1.0.109)

Published 2026-08-07. Last modified 2026-09-10.