CVE-2025-34072— Anthropic Slack MCP Server Data Exfiltration via Link Unfurling
Quick assessment
Affected
Anthropic Slack MCP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Anthropic Slack Model Context Protocol Server是Anthropic公司的一个链接大语言模型的开放标准协议。 Anthropic Slack Model Context Protocol Server存在安全漏洞，该漏洞源于数据处理不当，可能导致数据泄露。
Possible ATT&CK Techniques 2 AI
T1041 · Exfiltration Over C2 Channel T1537 · Transfer Data to Cloud Account
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I. Basic Information for CVE-2025-34072
Vulnerability Information
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Vulnerability Title
Anthropic Slack MCP Server Data Exfiltration via Link Unfurling
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Anthropic Slack Model Context Protocol Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Anthropic Slack Model Context Protocol Server是Anthropic公司的一个链接大语言模型的开放标准协议。 Anthropic Slack Model Context Protocol Server存在安全漏洞，该漏洞源于数据处理不当，可能导致数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Anthropic | Slack MCP Server | 0 | - |
|
II. Public POCs for CVE-2025-34072
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Security Blog Posts for CVE-2025-34072 (1)
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🔗 Security Advisory: Anthropic's Slack MCP Server Vulnerable to Data Exfiltration · Embrace The Red Read full article third-party-advisory technical-description exploit
IV. Related Vulnerabilities
V. Comments for CVE-2025-34072
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