---
id: CVE-2026-48039
title: >-
  Meta Ads MCP is a Model Context Protocol (MCP) server that lets AI assistants
  run Meta Ads
summary: >-
  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
  Streama…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-287
  - CWE-209
  - CWE-522
vendor: meta-ads-mcp
product: meta-ads-mcp
affected:
  - meta-ads-mcp <= 1.0.108
patched:
  - meta-ads-mcp 1.0.109
published: '2026-08-07'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:42:39.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48039'
references:
  - url: 'https://github.com/pipeboard-co/meta-ads-mcp/releases/tag/1.0.109'
    label: security-advisories@github.com
  - url: >-
      https://github.com/pipeboard-co/meta-ads-mcp/security/advisories/GHSA-9gw6-46qc-99vr
    label: security-advisories@github.com
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/meta-ads-mcp/PYSEC-2026-413.yaml
    label: security-advisories@github.com
  - url: >-
      https://github.com/pipeboard-co/meta-ads-mcp/security/advisories/GHSA-9gw6-46qc-99vr
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-9gw6-46qc-99vr'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00589
epssPercentile: 0.45897
aliases:
  - GHSA-9gw6-46qc-99vr
ecosystem: pip
ingestedAt: '2026-07-07T15:41:59.311Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-48039)

Affected packages:

- `meta-ads-mcp <= 1.0.108`

Patched in:

- `meta-ads-mcp 1.0.109`

Source: https://github.com/advisories/GHSA-9gw6-46qc-99vr