CVE-2025-34072 Information

Description

A data exfiltration vulnerability exists in Anthropic’s deprecated Slack Model Context Protocol (MCP) Server via automatic link unfurling. When an AI agent using the Slack MCP Server processes untrusted data it can be manipulated to generate messages containing attacker-crafted hyperlinks embedding sensitive data. Slack’s link preview bots (e.g. Slack-LinkExpanding Slackbot Slack-ImgProxy) will then issue outbound requests to the attacker-controlled URL resulting in zero-click exfiltration of private data.

Reference

https://embracethered.com/blog/posts/2025/security-advisory-anthropic-slack-mcp-server-data-leakage/ https://vulncheck.com/advisories/anthropic-slack-mcp-server-data-exfiltration A data exfiltration vulnerability exists in Anthropic’s deprecated Slack Model Context Protocol (MCP) Server via automatic link unfurling. When an AI agent using the Slack MCP Server processes untrusted data it can be manipulated to generate messages containing attacker-crafted hyperlinks embedding sensitive data. Slack’s link preview bots (e.g. Slack-LinkExpanding Slackbot Slack-ImgProxy) will then issue outbound requests to the attacker-controlled URL resulting in zero-click exfiltration of private data.

Related CNNVD

CNNVD-202507-142 (Published: 2025-07-02)