CVE-2026-20139

Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise

View on CVE.org

Published Feb 18, 2026 CVSS 3.1 · 4.3 Medium EPSS 5.7% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Splunk

Splunk Enterprise

affected

Version	Status	Constraints
`10.0`	affected	< 10.0.2
`9.4`	affected	< 9.4.8
`9.3`	affected	< 9.3.9
`9.2`	affected	< 9.2.12

Splunk

Splunk Cloud Platform

affected

Version	Status	Constraints
`10.2.2510`	affected	< 10.2.2510.3
`10.1.2507`	affected	< 10.1.2507.8
`10.0.2503`	affected	< 10.0.2503.9
`9.3.2411`	affected	< 9.3.2411.121

Configuration 1 [-]

OR	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::

No data.

Vendor Product Versions

Splunk

Splunk Cloud Platform

Version	Status	Scheme	Platform
`[10.2.2510,10.2.2510.3)`	affected	generic	—
`[10.1.2507,10.1.2507.8)`	affected	generic	—
`[10.0.2503,10.0.2503.9)`	affected	generic	—
`[9.3.2411,9.3.2411.121)`	affected	generic	—

Splunk

Splunk Enterprise

Version	Status	Scheme	Platform
`[10.0,10.0.2)`	affected	generic	—
`[9.4,9.4.8)`	affected	generic	—
`[9.3,9.3.9)`	affected	generic	—
`[9.2,9.2.12)`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: 5.7% (5.677% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://advisory.splunk.com/advisories/SVD-2026-0204

History

Feb 20, 2026 2:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Splunk splunk
CPEs		cpe:2.3:a:splunk:splunk:::::enterprise:::* cpe:2.3:a:splunk:splunk_cloud_platform::::::::
Vendors & Products		Splunk splunk

Feb 20, 2026 1:15 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Feb 19, 2026 10:30 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Splunk Splunk splunk Cloud Platform Splunk splunk Enterprise
Vendors & Products		Splunk Splunk splunk Cloud Platform Splunk splunk Enterprise

Feb 18, 2026 5:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise
Weaknesses		CWE-400
References		https://advisory.splunk.com/advisories/SVD-2026-0204
Metrics		cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}`