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CVE-2026-20139

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

MEDIUM
4.3
CVSS Score
Published: February 18, 2026 at 04:45 PM UTC
Updated: June 17, 2026 at 10:17 AM UTC
2 products affected across 1 vendorSplunkSplunk Cloud Platform

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Severity
MEDIUM4.3
Exploit prediction
EPSS 6%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Splunk· Splunk
95%
10.0 ≤ v < 10.0.210.0.0 ≤ v < 10.0.29.2 ≤ v < 9.2.129.2.0 ≤ v < 9.2.129.3 ≤ v < 9.3.99.3.0 ≤ v < 9.3.99.4 ≤ v < 9.4.89.4.0 ≤ v < 9.4.810.09.29.39.4
Affected range stops below 10.0.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.2.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.4.8, so it looks safe — our inference, not a vendor statement
Splunk Cloud Platform· Splunk
95%
10.0.2503 ≤ v < 10.0.2503.910.1.2507 ≤ v < 10.1.2507.810.2.2510 ≤ v < 10.2.2510.39.3.2411 ≤ v < 9.3.2411.12110.0.250310.1.250710.2.25109.3.2411
Affected range stops below 10.0.2503.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.1.2507.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.2.2510.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.2411.121, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://advisory.splunk.com/advisories/SVD-2026-0204

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMcisco
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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