CVE-2026-20139
Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise
At a glance
- Source
- NVD
- EPSS
- EPSS 5.68 % · percentile 93 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-400 — Uncontrolled Resource Consumption (DoS)
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L | cisco |
| CVSS 3.1 | MEDIUM 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L | NVD · psirt@cisco.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-8197
- GCVE · GCVE-0-2026-20139
CERT-FR advisories
- CERTFR-2026-AVI-0188 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*≥ 9.2.0 < 9.2.12cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*≥ 9.3.0 < 9.3.9cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*≥ 9.4.0 < 9.4.8cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*≥ 10.0.0 < 10.0.2cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*≥ 9.3.2411 < 9.3.2411.121cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*≥ 10.0.2503 < 10.0.2503.9cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*≥ 10.1.2507 < 10.1.2507.8cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*≥ 10.2.2510 < 10.2.2510.3
Affected products
| Product | Versions |
|---|---|
| Splunk · Splunk Enterprise | affected 10.0 < 10.0.2 ; affected 9.4 < 9.4.8 ; affected 9.3 < 9.3.9 ; affected 9.2 < 9.2.12 |
| Splunk · Splunk Cloud Platform | affected 10.2.2510 < 10.2.2510.3 ; affected 10.1.2507 < 10.1.2507.8 ; affected 10.0.2503 < 10.0.2503.9 ; affected 9.3.2411 < 9.3.2411.121 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |