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In this post, we show how an attacker can exploit supabase's mcp integration to leak a developer's private sql tables Cursor simply needs to implement the client side of the mcp spec and instantly its llm works with any server that also implements mcp. Model context protocol (mcp) has emerged as a standard way for llms to interact with external tools
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While this unlocks new capabilities, it also introduces new risk surfaces. Supabase), while decoupling them from each other Supabase mcp can leak your entire sql database (via) here's yet another example of a lethal trifecta attack, where an llm system combines access to private data, exposure to potentially malicious instructions and a mechanism to communicate data back out to an attacker.
This supabase/cursor incident is a cautionary tale
When ai has root access, you have a new class of confused deputy problems The model doesn't inherently know the difference between a text comment and an actionable command The key takeaway is that security controls can't reliably be enforced at endpoints alone. Over the past few months, there's been renewed discussion around the risks of connecting mcp servers to databases containing private data
A recent blog post by the team at general analysis ran the headline supabase mcp can leak your entire sql database. they went on to show that if you spin up a supabase instance with row level security and a default mcp server accessed through cursor. Connect your ai tools to supabase using mcp A critical security vulnerability in supabase's model context protocol (mcp) implementation has been discovered that allows attackers to extract entire sql databases through sophisticated prompt injection techniques The vulnerability demonstrates how ai agents can be manipulated to bypass security controls and leak sensitive data when connected to production databases.
The only supabase security tool that closes the loop in your ai agent
Audit, preview the fix, and apply it — without leaving claude / cursor / cline Audit my supabase project rkmrsefraqssuyuniyco claude Want me to apply all sql fixes Run preview_fix on each first.
But this speed often comes at a hidden cost, as security is frequently overlooked Consider the recent supabase breach An attacker posted a friendly support ticket with malicious content. Supabase engineer here working on mcp
A few weeks ago we added the following mitigations to help with prompt injections
You can easily manipulate the agent to leak sensitive data with really basic prompt injection attacks We already have seen many flaws and attacks on other mcp servers such as one from heroku's mcp server [0] and one from anthropic's mcp inspector [1] This issue from supabase for poor documentation is no different. Programación web y full stack con react, node.js, html, css, tailwind, next.js y deno.
A recent supabase mcp server vulnerability showed how an attacker could plant a prompt inside a support ticket to trick an ai agent into leaking secret api tokens from a private database An isomorphic javascript client for supabase Query your supabase database, subscribe to realtime events, upload and download files, browse typescript examples, invoke postgres functions via rpc, i… 生成AIモデルと他のツールをつなぐためのプロトコル「モデル・コンテキスト・プロトコル(MCP)」に脆弱(ぜいじゃく)性があり、アクセストークン.
The latest spec introduces security best practices like no token passthrough and enforced user consent.
Run until the specified task is completely finished, not asking for intermediate input from the user Before starting to implement, ask questions back to align on the specific details of the plan We heard the feedback that the. My free ai os course
