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Security Advisory: Anthropic's Slack MCP Server Vulnerable to Data Exfiltration

embracethered.com · published 24 June 2025

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https://www.anthropic.com/news/model-context-protocol

anthropic.com

https://github.com/modelcontextprotocol/servers/

github.com

The dangers of AI agents unfurling hyperlinks and what to do about it Read at the source ↗

embracethered.com

Don't blindly trust LLM responses. Threats to chatbots. Read at the source ↗

embracethered.com

https://github.com/modelcontextprotocol/servers/commit/d53d6cc75c9ff1957f76c6b97c1ca74771af347e

github.com

https://github.com/modelcontextprotocol/servers-archived/blob/main/SECURITY.md

github.com

https://embracethered.com/blog/posts/2025/anthropic-mcp-security-policy.png

embracethered.com

https://www.npmjs.com/package/@modelcontextprotocol/server-slack

npmjs.com

https://embracethered.com/blog/images/2025/anthropic-mcp-weekly.png

embracethered.com

https://simonwillison.net/2025/Jun/16/the-lethal-trifecta/

simonwillison.net

https://embracethered.com/blog/images/2025/anthropic-slack-mcp-exp.png

embracethered.com

Hidden Prompt Injections with Anthropic Claude Read at the source ↗

embracethered.com

https://github.com/modelcontextprotocol/servers-archived/blob/main/src/slack/index.ts

github.com

https://embracethered.com/blog/images/2025/anthropic-slack-mcp-demo0.png

embracethered.com

https://embracethered.com/blog/images/2025/anthropic-slack-mcp-demo1.png

embracethered.com

https://embracethered.com/blog/images/2025/anthropic-slack-mcp-demo2.png

embracethered.com

https://embracethered.com/blog/images/2025/anthropic-slack-mcp-demo3.png

embracethered.com

https://github.com/modelcontextprotocol/servers-archived/tree/main/src/slack

github.com

https://github.com/modelcontextprotocol/servers-archived/commit/9be4674d1ddf8c469e6461a27a337eeb65f76c2e

github.com

https://api.slack.com/reference/messaging/link-unfurling

api.slack.com

https://embracethered.com/blog/images/2025/claude-mcp-slack-disable-unfurl.png

embracethered.com

https://embracethered.com/blog/images/2025/anthropic-slack-exploit-ascii-smuggle.png

embracethered.com