CVE-2026-20139: Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise
Splunk · Splunk Enterprise
Vendor fix available · Affected: Splunk Enterprise · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 93% of scored CVEs
DescriptionCVE.org
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 products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Splunk · Splunk Enterprisefrom 10.0 before 10.0.2; from 9.4 before 9.4.8; from 9.3 before 9.3.9; from 9.2 before 9.2.12
- Splunk · Splunk Cloud Platformfrom 10.2.2510 before 10.2.2510.3; from 10.1.2507 before 10.1.2507.8; from 10.0.2503 before 10.0.2503.9; from 9.3.2411 before 9.3.2411.121
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Splunk
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-20139 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.