Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-20139

Severity CVSS v4.0:
Pending analysis
Type:
CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
18/02/2026
Last modified:
20/02/2026

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS v3.1 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): Low

Base Score 3.x
4.30
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* 9.2.0 (including) 9.2.12 (excluding)
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* 9.3.0 (including) 9.3.9 (excluding)
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* 9.4.0 (including) 9.4.8 (excluding)
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* 10.0.0 (including) 10.0.2 (excluding)
cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:* 9.3.2411 (including) 9.3.2411.121 (excluding)
cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:* 10.0.2503 (including) 10.0.2503.9 (excluding)
cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:* 10.1.2507 (including) 10.1.2507.8 (excluding)
cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:* 10.2.2510 (including) 10.2.2510.3 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools