- 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
- disclosure@vulncheck.com
- NVD status
- Awaiting Analysis
CVSS 4.0
- Type
- Secondary
- Base score
- 9.3
- Impact score
- -
- Exploitability score
- -
- Vector string
- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- CRITICAL
- disclosure@vulncheck.com
- CWE-20
- Hype score
- Not currently trending
CVE-2025-34072 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 … https://t.co/LM8In1Omoc
@CVEnew
2 Jul 2025
389 Impressions
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[CVE-2025-34072: CRITICAL] Data exfiltration vulnerability in Anthropic’s deprecated Slack MCP Server found. Manipulate AI agent via crafted hyperlinks to steal sensitive data without user interaction. #cybe...#cve,CVE-2025-34072,#cybersecurity https://t.co/YmsKnpHMvy https://t
@CveFindCom
2 Jul 2025
34 Impressions
0 Retweets
0 Likes
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0 Replies
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