CVE-2026-48039Public exploitNetwork attack vector

Access-token disclosure via unauthenticated MCP tool execution

Published Aug 7, 2026 · Updated Aug 7, 2026

Improper authentication in Pipeboard Meta Ads MCP before 1.0.109 allows remote attackers to invoke MCP tools and disclose an access token. The AuthInjectionMiddleware.dispatch method forwards requests lacking both supported credentials, while api.py places the fallback operator token in a Graph API URL that the error path returns in the JSON-RPC body. Any caller that can reach the HTTP MCP endpoint can act through connected ad accounts and obtain the token when a tool call triggers a Graph API error.

CVSS severity9.1
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Pipeboard Meta Ads MCP before 1.0.109 allows remote attackers to invoke MCP tools and disclose an access token. The AuthInjectionMiddleware.dispatch method forwards requests lacking both supported credentials, while api.py places the fallback operator token in a Graph API URL that the error path returns in the JSON-RPC body. Any caller that can reach the HTTP MCP endpoint can act through connected ad accounts and obtain the token when a tool call triggers a Graph API error.

The record

CVE
CVE-2026-48039
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
GoMarble AI
Product
Facebook/Meta Ads MCP Server
Classifications
CWE-209, CWE-522, CWE-287, T1528, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.109

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GoMarble AI · Facebook/Meta Ads MCP Serverversion=< 1.0.109

Published CVSS scores

9.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
CWE-522Insufficiently Protected Credentials
CWE-287Improper Authentication
T1528Steal Application Access Token
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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