CVE-2026-20139
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.
How to fix
- splunk splunk9.2.12, 9.3.9, 9.4.8, 10.0.2 or later
- splunk splunk_cloud_platform9.3.2411.121, 10.0.2503.9, 10.1.2507.8, 10.2.2510.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| splunk splunk | 9.2.0 ≤ v < 9.2.12, 9.3.0 ≤ v < 9.3.9, 9.4.0 ≤ v < 9.4.8, 10.0.0 ≤ v < 10.0.2 | 9.2.12, 9.3.9, 9.4.8, 10.0.2 |
| splunk splunk_cloud_platform | 9.3.2411 ≤ v < 9.3.2411.121, 10.0.2503 ≤ v < 10.0.2503.9, 10.1.2507 ≤ v < 10.1.2507.8, 10.2.2510 ≤ v < 10.2.2510.3 | 9.3.2411.121, 10.0.2503.9, 10.1.2507.8, 10.2.2510.3 |
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Attack Surface Management
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