# CVE-2026-76286: Server-Side Request Forgery (SSRF) through Custom API Tools in Splunk MCP Server

> CVE-2026-76286: Server-Side Request Forgery (SSRF) through Custom API Tools in Splunk MCP Server. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-76286
Last updated: 2026-10-08T20:08:45Z

- Published: 2026-10-07 20:46 UTC · Updated: 2026-10-08 20:08 UTC · Assigner: cisco
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:L
- EPSS: 0.17%, 7th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-918

## Description

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 (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.

## Affected vendors and products

- Splunk: Splunk MCP Server

## Tracked companies

- [Splunk](https://rewindex.com/company/splunk.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-76286)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-76286)
- [https://advisory.splunk.com/advisories/SVD-2026-1004](https://advisory.splunk.com/advisories/SVD-2026-1004)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-76286 · Markdown: https://rewindex.com/cve/CVE-2026-76286.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-76286 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:04:00.362Z