CVE-2026-48039

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductMeta-ads-mcp

PublishedAug 7, 2026

First seenAug 7, 2026

Weakness typeCWE-287Improper authentication

How to fix

Update

meta-ads-mcp1.0.109 or later

Affected products

Product	Affected versions	Fixed in
meta-ads-mcpPyPI	v < 1.0.109	1.0.109

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