CVE-2025-34072

Anthropic Slack MCP Server Data Exfiltration via Link Unfurling

CVSS 9.3 CRITICALEPSS 0.4%CWE-20 CWE-200

Vexday Risk Score

28Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 9.3EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

02 jul 2025Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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.

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

Productos afectados

Anthropic · Slack MCP Server

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Referencias

https://embracethered.com/blog/posts/2025/security-advisory-anthropic-slack-mcp-server-data-leakage/https://vulncheck.com/advisories/anthropic-slack-mcp-server-data-exfiltration