Medium [CVE-2026-76286] Server-Side Request Forgery (SSRF) through Custom API Tools in Splunk MCP Server
This medium-severity Splunk advisory covers CVE-2026-76286 affecting Splunk MCP Server.
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Summary
In Splunk MCP Server versions below 1.2.1, Splunk MCP Server could send the Splunk platform authentication token of a user who runs a custom Application Programming Interface (API) tool to the URL configured for that tool.
If another user controls that URL, they could capture the token and use it to access data and perform actions as the user who ran the tool. Successful exploitation requires a user who holds a role that contains the mcp_tool_execute capability to run a custom API tool configured by another user.
For more information see Configure the Splunk MCP Server ( ) and Managing custom tools in Splunk MCP Server ( ) in the Splunk documentation.
- Splunk MCP Server 1.2 before 1.2.1
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- For more information see Configure the Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/configure-the-splunk-mcp-server) and Managing custom tools in Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/managing-custom-tools-in-splunk-mcp-server) in the Splunk documentation.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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