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EUVD-2026-371239

fkie_cve-2026-54547

Meta Ads MCP is a Model Context Protocol (MCP) server that lets AI assistants run Meta Ads. Prior to version 1.0.115, AuthInjectionMiddleware in meta_ads_mcp/core/http_auth_integration.py rejects HTTP MCP requests only when both auth_token and pipeboard_token are absent, while extract_token_from_headers() does not recognize X-Pipeboard-Token as a primary credential. A network caller using the streamable-http transport can therefore send any X-Pipeboard-Token value, pass the guard without establishing authentication context, and cause get_auth_token() to fall back to the server operator's META_ACCESS_TOKEN. Subsequent MCP tools execute with the operator's Meta credentials and can read or modify the operator's Meta Ads data. Deployments using the default stdio transport or without META_ACCESS_TOKEN are not affected. This issue is fixed in version 1.0.115.

GHSA-2v2f-mvfg-ph56 — meta-ads-mcp: X-Pipeboard-Token Header Auth Bypass Reuses Operator Meta Token

Affected: PyPI: meta-ads-mcp

## X-Pipeboard-Token Header Auth Bypass Reuses Operator Meta Token

### Summary

`AuthInjectionMiddleware` in `meta-ads-mcp` rejects HTTP MCP requests only when **both** `auth_token` and `pipeboard_token` are absent. Because `extract_token_from_headers()` does not recognise the `X-Pipeboard-Token` header, an attacker who sends that header with any arbitrary value produces `auth_token = None` and `pipeboard_token = <attacker value>`, making the guard condition evaluate to `False` and passing the request through. No authentication context is set; the token getter falls back to the server operator's `META_ACCESS_TOKEN` environment variable. Every subsequent MCP tool call executes with the operator's Meta credentials, allowing an unauthenticated network caller to read and write the operator's Meta Ads data.

### Details

The vulnerable condition is at `meta_ads_mcp/core/http_auth_integration.py:259`:

```python # http_auth_integration.py:255-260 auth_token = FastMCPAuthIntegration.extract_token_from_headers(dict(request.headers)) pipeboard_token = FastMCPAuthIntegration.extract_pipeboard_token_from_headers(dict(request.headers))

if not auth_token and not pipeboard_token: # ← bypass condition return Response(..., status_code=401) ```

`extract_token_from_headers()` (lines 77–95) recognises only `Authorization: Bearer`, `X-META-ACCESS-TOKEN`, and `X-PIPEBOARD-API-TOKEN`. It does **not** recognise `X-Pipeboard-Token`, so that header never populates `auth_token`.

`extract…