# CVE-2026-20138

> A user of a Splunk Search Head Cluster deployment with access to the _internal index could view Duo authentication secrets in plain text.

- **CVSS:** 4.9 (MEDIUM)
- **EPSS:** 0.1%
- **CWE:** CWE-532

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-20138
Full threat coverage + IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp