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CVE-2026-48039

9.1 · CRITICAL

Meta Ads MCP is a Model Context Protocol (MCP) server that lets AI assistants run Meta Ads.

Published Aug 7, 2026CWE-287EPSS 0.59%

Overview

CVE-2026-48039 is a critical-severity vulnerability. It was published on August 7, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/pipeboard-co/meta-ads-mcp/releases/tag/1.0.109GitHubgithub.com/pipeboard-co/meta-ads-mcp/security/advisories/GHSA-9gw6-46qc-99vrGitHubgithub.com/pypa/advisory-database/tree/main/vulns/meta-ads-mcp/PYSEC-2026-413.yamlGitHubgithub.com/pipeboard-co/meta-ads-mcp/security/advisories/GHSA-9gw6-46qc-99vr

How CyberStrike helps

Frequently asked questions

What is CVE-2026-48039?

CVE-2026-48039 is a critical-severity vulnerability. It was published on August 7, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-48039?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-48039?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-48039?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-48039 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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