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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

Quick assessment

Affected
Splunk Splunk Enterprise
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk Cloud Platform和Splunk Enterprise都是美国Splunk公司的产品。Splunk Cloud Platform是一个强大的数据收集、处理和分析服务。Splunk Enterprise是一套数据收集分析软件。 Splunk Cloud Platform和Splunk Enterprise存在资源管理错误漏洞，该漏洞源于低权限用户可在修改密码时向REST API端点参数注入恶意有效载荷，可能导致客户端拒绝服务。以下产品及版本受到影响：Splunk Enterprise

CVSS 4.3 · Medium EPSS 5.05% · P92

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-20139

Vulnerability Information
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Vulnerability Title
Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Cloud Platform和Splunk Enterprise 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk Cloud Platform和Splunk Enterprise都是美国Splunk公司的产品。Splunk Cloud Platform是一个强大的数据收集、处理和分析服务。Splunk Enterprise是一套数据收集分析软件。 Splunk Cloud Platform和Splunk Enterprise存在资源管理错误漏洞，该漏洞源于低权限用户可在修改密码时向REST API端点参数注入恶意有效载荷，可能导致客户端拒绝服务。以下产品及版本受到影响：Splunk Enterprise
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk Enterprise 10.0 ~ 10.0.2 -
Splunk Splunk Cloud Platform 10.2.2510 ~ 10.2.2510.3 -

II. Public POCs for CVE-2026-20139

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III. Intelligence Information for CVE-2026-20139

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Vendor Advisories for CVE-2026-20139 (1)

Same Patch Batch · Splunk · 2026-02-18 · 6 CVEs total

CVE-2026-20142 6.8 MEDIUM Sensitive Information Disclosure in "_internal" index in Splunk Enterprise
CVE-2026-20138 6.8 MEDIUM Sensitive Information Disclosure in "_internal" index in Splunk Enterprise
CVE-2026-20144 6.8 MEDIUM Sensitive Information Disclosure in ''_internal'' index in Splunk Enterprise
CVE-2026-20141 4.3 MEDIUM Improper Access Control in Splunk Monitoring Console App
CVE-2026-20137 3.5 LOW Risky Commands Safeguards Bypass through preloaded Data Models due to Path Traversal vulne

IV. Related Vulnerabilities

Same product: Splunk Enterprise
Same vendor: Splunk
Same weakness: CWE-400

V. Comments for CVE-2026-20139

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