Security Advisory

CVE-2025-34072

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2025-07-02 13:46:31

Last updated 2025-07-02 20:29:17

Assigner VulnCheck

CVSS score not scored

State PUBLISHED

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.

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