Improper Neutralization of Input Used for LLM Prompting Affecting @modelcontextprotocol/server-slack package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-MODELCONTEXTPROTOCOLSERVERSLACK-11358378
- published1 Aug 2025
- disclosed2 Jul 2025
- creditwunderwuzzi of Embrace The Red
Introduced: 2 Jul 2025
CVE-2025-34072 (opens in a new tab)How to fix?
There is no fixed version for @modelcontextprotocol/server-slack.
Overview
@modelcontextprotocol/server-slack is a MCP server for interacting with Slack
Affected versions of this package are vulnerable to Improper Neutralization of Input Used for LLM Prompting via the automatic link unfurling process. An attacker can access sensitive information by manipulating an AI agent to generate messages containing attacker-crafted hyperlinks embedding sensitive data, which are then processed by link preview bots and sent to attacker-controlled URLs, enabling zero-click data exfiltration.