CVE-2026-20202 (GCVE-0-2026-20202)

Vulnerability from cvelistv5 – Published: 2026-04-15 15:17 – Updated: 2026-04-16 03:55
VLAI
Title
Improper Input Validation during User Account Creation in Splunk Enterprise
Summary
In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.6, 10.2.2510.10, 10.1.2507.20, 10.0.2503.13, and 9.3.2411.127, a user who holds a role that contains the high-privilege capability `edit_user`could create a specially crafted username that includes a null byte or a non-UTF-8 percent-encoded byte due to improper input validation.<br><br>This could lead to inconsistent conversion of usernames into a proper format for storage and account management inconsistencies, such as being unable to edit or delete affected users.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 00:00 UTC
CWE
  • CWE-176 - The software does not properly handle when an input contains Unicode encoding.
Assigner
cisco CNA under the mitre root
CNA scorecard C 66/100 over 442 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
Splunk Splunk Enterprise Affected: 10.2 , < 10.2.2 (custom)
Affected: 10.0 , < 10.0.5 (custom)
Affected: 9.4 , < 9.4.10 (custom)
Affected: 9.3 , < 9.3.11 (custom)
guessed Create a notification for this product.
Splunk Splunk Cloud Platform Affected: 10.4.2603 , < Not Affected (custom)
Affected: 10.3.2512 , < 10.3.2512.6 (custom)
Affected: 10.2.2510 , < 10.2.2510.10 (custom)
Affected: 10.1.2507 , < 10.1.2507.20 (custom)
Affected: 10.0.2503 , < 10.0.2503.13 (custom)
Affected: 9.3.2411 , < 9.3.2411.127 (custom)
guessed Create a notification for this product.
Date Public
2026-04-15 00:00
Show details on NVD website

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          "references": [
            {
              "url": "https://advisory.splunk.com/advisories/SVD-2026-0401"
            }
          ],
          "source": {
            "advisory": "SVD-2026-0401"
          },
          "title": "Improper Input Validation during User Account Creation in Splunk Enterprise"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "assignerShortName": "cisco",
        "cveId": "CVE-2026-20202",
        "datePublished": "2026-04-15T15:17:43.871Z",
        "dateReserved": "2025-10-08T11:59:15.397Z",
        "dateUpdated": "2026-04-16T03:55:28.582Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.