Vulnerability 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.
Related Weaknesses (CWE)
References
- https://embracethered.com/blog/posts/2025/security-advisory-anthropic-slack-mcp-
- https://vulncheck.com/advisories/anthropic-slack-mcp-server-data-exfiltration
FAQ
What is CVE-2025-34072?
CVE-2025-34072 is a documented vulnerability. 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 untrust...
How severe is CVE-2025-34072?
CVSS scoring is not yet available for CVE-2025-34072. Check NVD for updates.
Is there a patch for CVE-2025-34072?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.