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Six Python MCP Servers Vulnerable to Credential Theft and Tool Exploitation

By PulseAugur Editorial · [1 sources] ·

An open-source scanner named mcp-witness has identified six vulnerabilities across six Python MCP servers published on PyPI. These vulnerabilities fall into two categories: outbound SSRF in URL-fetching tools and inbound DNS rebinding on HTTP-transport MCP servers. The SSRF vulnerability, found in Anthropic's reference mcp-server-fetch and mcp-server-http-request, could allow an agent to retrieve cloud-metadata-service credentials. The DNS rebinding vulnerability, present in four other packages, could enable any webpage to issue tool calls against locally running MCP servers. Despite responsible disclosure and a proposed fix, some vulnerabilities remain unaddressed. AI

IMPACT Highlights critical security flaws in AI agent transport layers, potentially impacting secure tool invocation and credential management.

RANK_REASON Disclosure of multiple vulnerabilities in open-source software by an independent researcher. [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Six Python MCP Servers Vulnerable to Credential Theft and Tool Exploitation

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42 / 100
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Tool
Disclosure of multiple vulnerabilities in open-source software by an independent researcher. [lever_c_demoted from research: ic=1 ai=1.0]
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, safety
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High
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Breaking (< 6h)
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Dishant Desle ·

    The MCP Transport Layer Blind Spot

    <p><em>This was first published on <a href="https://desledishant10.github.io/mcp-witness/docs/mcp-transport-layer-blind-spot" rel="noopener noreferrer">my site</a> and is cross-posted here; the version on my site is canonical and the one I keep current. It is authorized research:…

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