NCSC-2026-0198

Vulnerability from csaf_ncscnl - Published: 2026-06-15 08:27 - Updated: 2026-06-15 08:27
Summary
Kwetsbaarheden verholpen in Splunk Enterprise en Splunk Cloud Platform
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Splunk heeft meerdere kwetsbaarheden verholpen in Splunk Enterprise en Splunk Cloud Platform.
Interpretaties: De kwetsbaarheden betreffen verschillende onderdelen van Splunk Enterprise en Splunk Cloud Platform. Splunk heeft de kwetsbaarheid met kenmerk CVE-2026-20253 in de PostgreSQL sidecar service endpoint als kritiek beoordeeld en maakt het mogelijk voor niet-geauthenticeerde gebruikers om willekeurige bestanden aan te maken of te verwijderen door het ontbreken van authenticatiecontroles. Een andere kwetsbaarheid met kenmerk CVE-2026-20251 betreft een Remote Code Execution (RCE) via onveilige deserialisatie van KV Store data met de 'jsonpickle' Python library, waarbij laaggeprivilegieerde gebruikers zonder admin- of power-rollen code op afstand kunnen uitvoeren. Verder zijn meerdere kwetsbaarheden vastgesteld die het mogelijk maken om gevoelige gegevens te exfiltreren via onder meer SSRF-, CSS-injectie- en XSS-aanvallen. Door onvoldoende validatie van URL’s, domeinen en gebruikersinvoer kunnen aanvallers beveiligingscontroles omzeilen, interne systemen benaderen en data buitmaken.
Oplossingen: Splunk heeft updates uitgebracht om de kwetsbaarheden in Splunk Enterprise en Splunk Cloud Platform te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-20: Improper Input Validation
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-284: Improper Access Control
CWE-306: Missing Authentication for Critical Function
CWE-502: Deserialization of Untrusted Data
CWE-918: Server-Side Request Forgery (SSRF)
CVE-2026-20253

Certain older versions of Splunk Enterprise and Splunk Cloud Platform contain a vulnerability in the PostgreSQL sidecar service endpoint that allows unauthenticated users to create or truncate arbitrary files due to missing authentication controls.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-306 - Missing Authentication for Critical Function
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20251

A Remote Code Execution vulnerability in certain versions of Splunk Enterprise, Splunk Cloud Platform, and Splunk Secure Gateway allows low-privileged users to exploit unsafe deserialization of KV Store data via the 'jsonpickle' Python library.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-502 - Deserialization of Untrusted Data
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20252

A vulnerability in Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to perform server-side request forgery via the Dashboard Studio PDF export feature due to improper trusted-domain validation and automatic HTTP redirect handling.

7.6 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
CWE-918 - Server-Side Request Forgery (SSRF)
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20254

Certain versions of Splunk Enterprise and Splunk Cloud Platform contain a CSS injection vulnerability in classic dashboards that allows low-privileged users to exfiltrate sensitive data via insufficient Trusted Domains validation when viewed by higher-privileged users.

5.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20255

A vulnerability in Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to create malicious classic dashboards that can exfiltrate sensitive data due to incomplete URL validation in the external content dialog.

5.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20256

A vulnerability in certain versions of Splunk Enterprise and Splunk Cloud Platform enables low-privileged users to exfiltrate data via protocol-relative URLs in classic dashboard drill-down links, bypassing URL validation and external-navigation warnings.

5.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20257

A vulnerability in Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to exfiltrate sensitive data from higher-privileged browsers via crafted dashboards exploiting insufficient style attribute validation, requiring phishing to execute.

5.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20259

Certain versions of Splunk Enterprise and Splunk Cloud Platform contain an access control flaw allowing users with the `edit_saved_search_owner` capability to improperly reassign saved search ownership beyond their authorized scope.

5.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
CVE-2026-20258

A vulnerability in certain versions of Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to execute unauthorized JavaScript code in another user's browser via malicious HTML panels in classic dashboards.

7.1 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
vers:unknown/*
Splunk / Splunk Cloud Platform
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Enterprise
 vers:unknown/*
vers:unknown/*
Splunk / Splunk Secure Gateway
 vers:unknown/*
vers:unknown/*
Splunk / splunk
 vers:unknown/*
References
To clipboard 

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        "name": "Deserialization of Untrusted Data"
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          "title": "CWE-502"
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          "text": "A Remote Code Execution vulnerability in certain versions of Splunk Enterprise, Splunk Cloud Platform, and Splunk Secure Gateway allows low-privileged users to exploit unsafe deserialization of KV Store data via the \u0027jsonpickle\u0027 Python library.",
          "title": "Summary"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20251.json"
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          "text": "Server-Side Request Forgery (SSRF)",
          "title": "CWE-918"
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          "title": "Summary"
        }
      ],
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20252.json"
        }
      ],
      "scores": [
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            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
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      "title": "CVE-2026-20252"
    },
    {
      "cve": "CVE-2026-20254",
      "notes": [
        {
          "category": "description",
          "text": "Certain versions of Splunk Enterprise and Splunk Cloud Platform contain a CSS injection vulnerability in classic dashboards that allows low-privileged users to exfiltrate sensitive data via insufficient Trusted Domains validation when viewed by higher-privileged users.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20254 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20254.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-20254"
    },
    {
      "cve": "CVE-2026-20255",
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability in Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to create malicious classic dashboards that can exfiltrate sensitive data due to incomplete URL validation in the external content dialog.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20255 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20255.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-20255"
    },
    {
      "cve": "CVE-2026-20256",
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability in certain versions of Splunk Enterprise and Splunk Cloud Platform enables low-privileged users to exfiltrate data via protocol-relative URLs in classic dashboard drill-down links, bypassing URL validation and external-navigation warnings.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20256 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20256.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-20256"
    },
    {
      "cve": "CVE-2026-20257",
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability in Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to exfiltrate sensitive data from higher-privileged browsers via crafted dashboards exploiting insufficient style attribute validation, requiring phishing to execute.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20257 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20257.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-20257"
    },
    {
      "cve": "CVE-2026-20259",
      "notes": [
        {
          "category": "description",
          "text": "Certain versions of Splunk Enterprise and Splunk Cloud Platform contain an access control flaw allowing users with the `edit_saved_search_owner` capability to improperly reassign saved search ownership beyond their authorized scope.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20259 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20259.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-20259"
    },
    {
      "cve": "CVE-2026-20258",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
          "title": "CWE-79"
        },
        {
          "category": "description",
          "text": "A vulnerability in certain versions of Splunk Enterprise and Splunk Cloud Platform allows low-privileged users to execute unauthorized JavaScript code in another user\u0027s browser via malicious HTML panels in classic dashboards.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20258 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20258.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-20258"
    }
  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.