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Advisory record · GHSA-9gw6-46qc-99vr

Meta Ads MCP: Unauthenticated HTTP MCP Tool Execution Leaks Operator Meta Access Token

CVSS 9.1 CriticalCriticalEPSS 0.0059 · 48th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 11 Jun 2026, 13:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
meta-ads-mcpPyPI<1.0.1091.0.109
Identifiers
GHSA-9gw6-46qc-99vr · CVE-2026-48039 · PYSEC-2026-413
Weakness (CWE)
CWE-209 · CWE-287 · CWE-522
Tags
Published
11 Jun 2026
Updated
7 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Meta Ads MCP (PyPI meta-ads-mcp) versions before 1.0.109 are affected. A network-reachable attacker with no credentials can call MCP tools over the HTTP transport, and when a Meta Graph API call fails, the operator's Meta access token can be returned in the error response, letting the attacker reach the Meta Graph API directly. Upgrade to version 1.0.109, which is the fixed release.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0059, the 48th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:40 UTC First seen by agentprime
  2. 31 Oct 2026, 14:40 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.