MCP Server Tool Poisoning

high Web App Scanning Plugin ID 114921

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Synopsis

MCP Server Tool Poisoning

Description

Model Context Protocol (MCP) Server Tool Poisoning occurs when malicious actors manipulate tool configurations or metadata on a malicious MCP server. This can lead to the execution of unauthorized commands, data corruption, or the deployment of malicious tools. Such vulnerabilities are particularly dangerous in AI development environments, where poisoned tools can compromise the integrity of the development process and lead to further exploitation.

Solution

Review MCP server tools metadata to ensure that they do not contain malicious configurations or commands. Implement strict validation and sanitization of tool metadata to prevent the execution of unauthorized commands or sensitive action. Regularly audit MCP server configurations and tools to detect and mitigate potential poisoning attempts.

See Also

https://invariantlabs.ai/blog/mcp-security-notification-tool-poisoning-attacks

Plugin Details

Severity: High

ID: 114921

Type: remote

Family: Artificial Intelligence

Published: 7/18/2025

Updated: 7/18/2025

Scan Template: api, basic, full, pci, scan

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: Tenable

CVSS v3

Risk Factor: High

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS Score Source: Tenable

CVSS v4

Risk Factor: High

Base Score: 7.5

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: Tenable

Reference Information

CWE: 20

OWASP: 2010-A4, 2013-A4, 2017-A5, 2021-A3

WASC: Improper Input Handling

CAPEC: 10, 101, 104, 108, 109, 110, 120, 13, 135, 136, 14, 153, 182, 209, 22, 23, 230, 231, 24, 250, 261, 267, 28, 3, 31, 42, 43, 45, 46, 47, 473, 52, 53, 588, 63, 64, 67, 7, 71, 72, 73, 78, 79, 8, 80, 81, 83, 85, 88, 9

DISA STIG: APSC-DV-002560

HIPAA: 164.306(a)(1), 164.306(a)(2)

ISO: 27001-A.14.2.5

NIST: sp800_53-SI-10

OWASP API: 2019-API7, 2023-API8

OWASP ASVS: 4.0.2-5.1.3

PCI-DSS: 3.2-6.5