CVE-2026-48039
Published:August 07, 2026
Updated:September 01, 2026
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 Packages
meta-ads-mcp (PYTHON):
Affected version(s) >=0.1.0 <1.0.109Fix Suggestion:
Update to version 1.0.109Related Resources (8)
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Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.34