CVE-2026-20139

🗓️ 18 Feb 2026 16:45:32Reported by ciscoType

cve🔗 web.nvd.nist.gov👁 43 Views🌐 WEB

CVE-2026-20139 allows low-privilege users to trigger a client-side denial of service by crafting payloads in realname, timezone, or email through the authentication users web endpoint during password change.

Reporter	Title	Published	Views	Family All 10
ATTACKERKB	CVE-2026-20139	18 Feb 202616:45	–	attackerkb
CNNVD	Splunk Cloud Platform和Splunk Enterprise 资源管理错误漏洞	18 Feb 202600:00	–	cnnvd
Cvelist	CVE-2026-20139 Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise	18 Feb 202616:45	–	cvelist
NCSC	Vulnerabilities fixed in Splunk Enterprise and Splunk Cloud Platform	23 Feb 202614:27	–	ncsc
NVD	CVE-2026-20139	18 Feb 202618:24	–	nvd
OSV	CVE-2026-20139	18 Feb 202618:24	–	osv
Positive Technologies	PT-2026-20470	18 Feb 202600:00	–	ptsecurity
RedhatCVE	CVE-2026-20139	19 Feb 202619:21	–	redhatcve
Tenable Nessus	Splunk Enterprise 9.2.0 < 9.2.12, 9.3.0 < 9.3.9, 9.4.0 < 9.4.8, 10.0.0 < 10.0.2 (SVD-2026-0204)	18 Feb 202600:00	–	nessus
Vulnrichment	CVE-2026-20139 Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise	18 Feb 202616:45	–	vulnrichment

NVD

Node

splunk splunkRange9.2.0–9.2.12enterprise

splunk splunkRange9.3.0–9.3.9enterprise

splunk splunkRange9.4.0–9.4.8enterprise

splunk splunkRange10.0.0–10.0.2enterprise

splunk splunk_cloud_platformRange9.3.2411–9.3.2411.121

splunk splunk_cloud_platformRange10.0.2503–10.0.2503.9

splunk splunk_cloud_platformRange10.1.2507–10.1.2507.8

splunk splunk_cloud_platformRange10.2.2510–10.2.2510.3

[
  {
    "product": "Splunk Enterprise",
    "vendor": "Splunk",
    "versions": [
      {
        "version": "10.0",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "10.0.2"
      },
      {
        "version": "9.4",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "9.4.8"
      },
      {
        "version": "9.3",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "9.3.9"
      },
      {
        "version": "9.2",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "9.2.12"
      }
    ]
  },
  {
    "product": "Splunk Cloud Platform",
    "vendor": "Splunk",
    "versions": [
      {
        "version": "10.2.2510",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "10.2.2510.3"
      },
      {
        "version": "10.1.2507",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "10.1.2507.8"
      },
      {
        "version": "10.0.2503",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "10.0.2503.9"
      },
      {
        "version": "9.3.2411",
        "status": "affected",
        "versionType": "custom",
        "lessThan": "9.3.2411.121"
      }
    ]
  }
]

Source	Link
advisory	www.advisory.splunk.com/advisories/SVD-2026-0204

Parameter	Position	Path	Description	CWE
realname	request body	/splunkd/__raw/services/authentication/users/username	Low-privileged user may inject payload into realname, tz, or email when changing password via the authentication/users/username REST endpoint, potentially causing client-side DoS or degraded performance.	CWE-400
tz	request body	/splunkd/__raw/services/authentication/users/username	Low-privileged user may inject payload into realname, tz, or email when changing password via the authentication/users/username REST endpoint, potentially causing client-side DoS or degraded performance.	CWE-400
email	request body	/splunkd/__raw/services/authentication/users/username	Low-privileged user may inject payload into realname, tz, or email when changing password via the authentication/users/username REST endpoint, potentially causing client-side DoS or degraded performance.	CWE-400

17 Jun 2026 10:17Current

5.5Medium risk

Vulners AI Score5.5

CVSS 3.14.3

EPSS0.04859

SSVC

CWE-400