New Vulnerability Discovered in Cursor Coding Tool Could Allow Persistent Code Execution
A recently identified security vulnerability in Cursor, the AI-powered coding tool developed by Vibe, has raised concerns within the developer community. Published by The Register on August 5, 2025, the report details how an issue within Cursor’s MCP (Message/Command Protocol) implementation could potentially allow for persistent code execution.
The vulnerability, dubbed “mcpoison,” reportedly stems from how Cursor handles specific messages within its communication protocol. While the technical specifics are still being analyzed, the core concern is that malicious actors might be able to craft specially designed inputs that, when processed by Cursor, could lead to the execution of unintended code. This could, in a worst-case scenario, grant unauthorized access or allow for the manipulation of a user’s development environment.
Cursor, lauded for its ability to assist developers with code generation, debugging, and understanding complex codebases, relies heavily on its internal communication mechanisms to function. The MCP is a crucial part of this, enabling the seamless interaction between different components of the tool. A flaw in this protocol, as described by The Register, could have significant implications for the security of projects developed using Cursor.
The report suggests that the “persistent code execution” aspect of the vulnerability is particularly worrying. This implies that the malicious code, once executed, might not simply run once but could remain active, potentially allowing for ongoing control or data exfiltration.
At the time of reporting, details on the exact scope of the vulnerability and the conditions under which it could be exploited are still emerging. It is advisable for users of Cursor to stay informed about any official advisories or updates released by Vibe. The developer community is keenly awaiting further information and any recommended mitigation strategies to ensure the security of their development workflows.
This discovery underscores the ongoing importance of rigorous security testing and auditing, even for tools designed to enhance developer productivity. As AI-integrated development environments become more prevalent, addressing such vulnerabilities proactively will be paramount to maintaining trust and security in the software development lifecycle.
Vibe coding tool Cursor’s MCP implementation allows persistent code execution
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