Splunk Enterprise <10.2.0 & <10.0.2 DoS via /services/auth/users API
CVE-2026-20139 Published on February 18, 2026
Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise
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 clientside denialofservice (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-20139 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-20139
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Affected Versions
Splunk Enterprise:- Version 10.0 and below 10.0.2 is affected.
- Version 9.4 and below 9.4.8 is affected.
- Version 9.3 and below 9.3.9 is affected.
- Version 9.2 and below 9.2.12 is affected.
- Version 10.2.2510 and below 10.2.2510.3 is affected.
- Version 10.1.2507 and below 10.1.2507.8 is affected.
- Version 10.0.2503 and below 10.0.2503.9 is affected.
- Version 9.3.2411 and below 9.3.2411.121 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.