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Cursor's MCP Trust Flaw Allows Persistent RCE; Scanner Released

By PulseAugur Editorial · [1 sources] ·

A security vulnerability, CVE-2025-54136 or "MCPoison," has been identified in Cursor's MCP (Machine Configuration Protocol) server trust mechanism. This flaw allowed for persistent remote code execution if a user approved a malicious MCP server configuration, as Cursor would not re-prompt for subsequent changes. While patched, the underlying issue of trusting configurations indefinitely persists, prompting the development of a free scanner to detect similar vulnerabilities in user configurations. AI

IMPACT Highlights potential security risks in AI development tools and the need for robust configuration management.

RANK_REASON The item discusses a security vulnerability in a specific software product and the release of a tool to detect it.

Read on r/cursor →

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

Cursor's MCP Trust Flaw Allows Persistent RCE; Scanner Released

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Tool
The item discusses a security vulnerability in a specific software product and the release of a tool to detect it.
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product, safety
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High
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102 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

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COVERAGE [1]

  1. r/cursor TIER_2 English(EN) · /u/loganbxdev ·

    Cursor's MCP trust is "approve once, trust forever" — here's a free way to check your config

    <!-- SC_OFF --><div class="md"><p>If you run MCP servers in Cursor, CVE-2025-54136 (&quot;MCPoison&quot;, found by Check Point) is worth knowing about: Cursor trusted an approved mcp.json forever, so once you approved a server, someone with write access to a shared repo could swa…

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