CVE-2026-20139 – Client-Side Denial of Service (DoS) through ”/splunkd/__raw/services/authentication/users/username” REST API endpoint in Splunk Enterprise

CVE ID : CVE-2026-20139

Published : Feb. 18, 2026, 6:24 p.m. | 35 minutes ago

Description : In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the “admin” or “power” Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.

Severity: 4.3 | MEDIUM

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