Anthropic Slack MCP Server Data Exfiltration via Link Unfurling

Advisories

severity: critical
date: July 1, 2025
Affecting: All default deployments of Anthropic Slack MCP Server
CVE: CVE-2025-34072
CVE type: Information Disclosure
CVSS: 9.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
References: Disclosure & PoC
Credit: wunderwuzzi of Embrace The Red