Vulnerability-Lookup

GHSA-4VMX-R9FJ-4CM5

Vulnerability from github – Published: 2026-02-18 18:30 – Updated: 2026-02-19 21:30

Details

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.

Severity ?

4.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-20139"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-18T18:24:26Z",
    "severity": "MODERATE"
  },
  "details": "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\u2011side denial\u2011of\u2011service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.",
  "id": "GHSA-4vmx-r9fj-4cm5",
  "modified": "2026-02-19T21:30:44Z",
  "published": "2026-02-18T18:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20139"
    },
    {
      "type": "WEB",
      "url": "https://advisory.splunk.com/advisories/SVD-2026-0204"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-20139 (GCVE-0-2026-20139)

Vulnerability from cvelistv5 – Published: 2026-02-18 16:45 – Updated: 2026-02-19 19:28

Title

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

Summary

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.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-400 - The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

Assigner

cisco

References

URL

Tags

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

Impacted products

Vendor

Product

Version

Splunk

Splunk Enterprise

Affected: 10.0 , < 10.0.2 (custom)
Affected: 9.4 , < 9.4.8 (custom)
Affected: 9.3 , < 9.3.9 (custom)
Affected: 9.2 , < 9.2.12 (custom)

Splunk

Splunk Cloud Platform

Affected: 10.2.2510 , < 10.2.2510.3 (custom)
Affected: 10.1.2507 , < 10.1.2507.8 (custom)
Affected: 10.0.2503 , < 10.0.2503.9 (custom)
Affected: 9.3.2411 , < 9.3.2411.121 (custom)

Credits

STÖK / Fredrik Alexandersson

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-20139",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-19T19:10:51.635917Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
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                "description": "CWE-400 Uncontrolled Resource Consumption",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-19T19:28:04.863Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Splunk Enterprise",
          "vendor": "Splunk",
          "versions": [
            {
              "lessThan": "10.0.2",
              "status": "affected",
              "version": "10.0",
              "versionType": "custom"
            },
            {
              "lessThan": "9.4.8",
              "status": "affected",
              "version": "9.4",
              "versionType": "custom"
            },
            {
              "lessThan": "9.3.9",
              "status": "affected",
              "version": "9.3",
              "versionType": "custom"
            },
            {
              "lessThan": "9.2.12",
              "status": "affected",
              "version": "9.2",
              "versionType": "custom"
            }
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        },
        {
          "product": "Splunk Cloud Platform",
          "vendor": "Splunk",
          "versions": [
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              "status": "affected",
              "version": "10.2.2510",
              "versionType": "custom"
            },
            {
              "lessThan": "10.1.2507.8",
              "status": "affected",
              "version": "10.1.2507",
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            },
            {
              "lessThan": "10.0.2503.9",
              "status": "affected",
              "version": "10.0.2503",
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            },
            {
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      ],
      "datePublic": "2026-02-18T00:00:00.000Z",
      "descriptions": [
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          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
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          ],
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
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          },
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          "scenarios": [
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      "problemTypes": [
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-18T16:45:32.308Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
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      },
      "references": [
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          "url": "https://advisory.splunk.com/advisories/SVD-2026-0204"
        }
      ],
      "source": {
        "advisory": "SVD-2026-0204"
      },
      "title": "Client-Side Denial of Service (DoS) through \u0027\u0027/splunkd/__raw/services/authentication/users/username\u0027\u0027 REST API endpoint in Splunk Enterprise"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
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    "datePublished": "2026-02-18T16:45:32.308Z",
    "dateReserved": "2025-10-08T11:59:15.382Z",
    "dateUpdated": "2026-02-19T19:28:04.863Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-4VMX-R9FJ-4CM5

CVE-2026-20139 (GCVE-0-2026-20139)

Tags

Sightings

Nomenclature