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VulnerabilitiesApr 16, 2026

Splunk Enterprise Update Patches Code Execution Vulnerability

Splunk patches high-severity RCE vulnerability in Enterprise and Cloud Platform.

Splunk released security updates addressing multiple vulnerabilities across its products, including a high-severity remote code execution flaw (CVE-2026-20204) in Splunk Enterprise and Cloud Platform that allows low-privileged users to upload malicious files to a temporary directory. Additional high-severity vulnerability CVE-2026-20205 in MCP Server app could expose user sessions and authorization tokens. Users are advised to update to patched versions (10.2.2, 10.0.5, 9.4.10, 9.3.11 or higher), with no evidence of active exploitation reported.

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The lesson from this incident

Full lesson

Splunk Enterprise contained a high-severity remote code execution vulnerability (CVE-2026-20204) that allowed low-privileged users to upload malicious files to temporary directories, potentially leading to full system compromise. An additional vulnerability (CVE-2026-20205) in the MCP Server app could expose sensitive user sessions and authorization tokens. This incident highlights the critical importance of maintaining current patch levels for enterprise security platforms, as these systems often have elevated privileges and access to sensitive organizational data. While no active exploitation has been reported, the combination of remote code execution capabilities and session token exposure creates significant risk for organizations running unpatched versions.

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Indicators of Compromise

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  • cve — CVE-2026-20204
  • cve — CVE-2026-20205

Entities

Splunk (vendor)Splunk Enterprise (product)Splunk Cloud Platform (product)MCP Server (product)