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

28Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

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

Ciclo de vida

02 jul 2025Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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

Produtos afetados

Anthropic · Slack MCP Server

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Referências

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