CVE-2026-20139
Last modified
CVE-2026-20139 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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). EPSS estimates a 5.15% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Splunk | Splunk | >= 9.2.0, < 9.2.12 |
| Splunk | Splunk | >= 9.3.0, < 9.3.9 |
| Splunk | Splunk | >= 9.4.0, < 9.4.8 |
| Splunk | Splunk | >= 10.0.0, < 10.0.2 |
| Splunk | Splunk Cloud Platform | >= 9.3.2411, < 9.3.2411.121 |
| Splunk | Splunk Cloud Platform | >= 10.0.2503, < 10.0.2503.9 |
| Splunk | Splunk Cloud Platform | >= 10.1.2507, < 10.1.2507.8 |
| Splunk | Splunk Cloud Platform | >= 10.2.2510, < 10.2.2510.3 |
References
- https://advisory.splunk.com/advisories/SVD-2026-0204Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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