CVE-2026-20139: 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…

PriorityP433medium4.3CVSS 3.1

AVNACLPRLUINSUCNINAL

EPSS

5.15%

91.4th percentile

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.

Affected

12 ranges

Vendor	Product	Version range	Fixed in
splunk	splunk	>= 10.0.0 < 10.0.2	10.0.2
splunk	splunk	>= 9.2.0 < 9.2.12	9.2.12
splunk	splunk	>= 9.3.0 < 9.3.9	9.3.9
splunk	splunk	>= 9.4.0 < 9.4.8	9.4.8
splunk	splunk_cloud_platform	>= 10.0.2503 < 10.0.2503.9	10.0.2503.9
splunk	splunk_cloud_platform	>= 10.1.2507 < 10.1.2507.8	10.1.2507.8
splunk	splunk_cloud_platform	>= 10.2.2510 < 10.2.2510.3	10.2.2510.3
splunk	splunk_cloud_platform	>= 9.3.2411 < 9.3.2411.121	9.3.2411.121
splunk	splunk_enterprise	>= 10.0 < 10.0.2	10.0.2
splunk	splunk_enterprise	>= 9.2 < 9.2.12	9.2.12
splunk	splunk_enterprise	>= 9.3 < 9.3.9	9.3.9
splunk	splunk_enterprise	>= 9.4 < 9.4.8	9.4.8

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