CVE-2026-11624

9.4

CRITICAL CVSS 4.0

Model Context Protocol DNS Rebinding Vulnerability

Overview

Description

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup. Both flags default to "*", allowing users to implement strict access controls as needed without breaking existing setups. If either flag is set to "*", the server will output a startup warning about potential vulnerabilities. Documentation has also been updated to highlight these security considerations.

Details

INFO

Published Date :

June 13, 2026, 10:16 a.m.

Last Modified :

July 23, 2026, 9:10 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-11624 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Google	mcp_toolbox_for_databases

: Total Affected Vendor : 1 | Products : 1

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Version	Severity	Source
CVSS		134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 4.0	CRITICAL	14ed7db2-1595-443d-9d34-6215bf890778
CVSS 4.0	CRITICAL	[email protected]

Solution

Configure allowed hosts and origins to prevent DNS rebinding attacks.

Update to v0.25.0 or later.
Set explicit --allowed-hosts.
Set explicit --allowed-origins.
Review server startup warnings.

Public PoC/Exploit Available at Github

CVE-2026-11624 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-11624.

URL	Resource
https://github.com/googleapis/mcp-toolbox/issues/3113
https://github.com/googleapis/mcp-toolbox/pull/2254

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-11624 is associated with the following CWEs:

CWE-346: Origin Validation Error

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-11624 weaknesses.

CAPEC-21: Exploitation of Trusted Identifiers Exploitation of Trusted Identifiers CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-75: Manipulating Writeable Configuration Files Manipulating Writeable Configuration Files CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-89: Pharming Pharming CAPEC-111: JSON Hijacking (aka JavaScript Hijacking) JSON Hijacking (aka JavaScript Hijacking) CAPEC-141: Cache Poisoning Cache Poisoning CAPEC-142: DNS Cache Poisoning DNS Cache Poisoning CAPEC-160: Exploit Script-Based APIs Exploit Script-Based APIs CAPEC-384: Application API Message Manipulation via Man-in-the-Middle Application API Message Manipulation via Man-in-the-Middle CAPEC-385: Transaction or Event Tampering via Application API Manipulation Transaction or Event Tampering via Application API Manipulation CAPEC-386: Application API Navigation Remapping Application API Navigation Remapping CAPEC-387: Navigation Remapping To Propagate Malicious Content Navigation Remapping To Propagate Malicious Content CAPEC-388: Application API Button Hijacking Application API Button Hijacking CAPEC-510: SaaS User Request Forgery SaaS User Request Forgery

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

asifshaik2230/mcp-sentinel

None

Dockerfile Shell Java Python

Updated: 1 week, 4 days ago

0 stars 0 fork 0 watcher

Born at : July 14, 2026, 3:55 p.m. This repo has been linked 1 different CVEs too.

mcp-security-project/mcp-cve-project

The Project shares all information on MCP related CVE's published

mcp mcp-security mcp-cve

Updated: 1 week, 6 days ago

19 stars 4 fork 4 watcher

Born at : May 7, 2026, 3:47 p.m. This repo has been linked 307 different CVEs too.

sattyamjjain/agent-airlock

A deny-by-default contract & type-checker layer for AI agent tool calls — Pydantic-based, in-process, zero-core-deps. Validates the actual tool-call payload (ghost-arg stripping, strict types, self-healing retries) beneath MCP gateways & firewalls. Works with LangChain, OpenAI Agents SDK, PydanticAI & CrewAI.

ai-agents ai-security crewai firewall langchain llm-safety mcp-server openai pii-masking pydantic-ai python rbac sandbox tool-validation zero-trust

Python Makefile JavaScript HTML CSS Dockerfile

Updated: 1 week, 5 days ago

10 stars 3 fork 3 watcher

Born at : Jan. 31, 2026, 8:43 a.m. This repo has been linked 23 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-11624 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-11624 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

CVE Translated by [email protected]

Jul. 23, 2026

Action	Type	Old Value	New Value
Added	Translation		Title: MCP Toolbox for Databases de Google, Description: El Protocolo de Contexto del Modelo tiene una advertencia de seguridad que aconseja a los servidores validar el encabezado 'Origin' en todas las conexiones entrantes para prevenir ataques de revinculación de DNS. Antes del lanzamiento de la versión v0.25.0, los usuarios no tenían forma de validar el host del origen. En la versión v0.25.0, se introdujo una nueva bandera '--allowed-hosts' junto con la bandera '--allowed-origins' existente, lo que permite a los usuarios especificar hosts permitidos al inicio del servidor. Ambas banderas tienen un valor predeterminado de '', lo que permite a los usuarios implementar controles de acceso estrictos según sea necesario sin romper las configuraciones existentes. Si cualquiera de las banderas se establece en '', el servidor emitirá una advertencia de inicio sobre posibles vulnerabilidades. La documentación también se ha actualizado para destacar estas consideraciones de seguridad.

CVE Modified by [email protected]

Jun. 17, 2026

Action	Type	Old Value	New Value
Added	Affected		[{'vendor': 'Google', 'product': 'MCP Toolbox for Databases', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.25.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}]

CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0