{"api_version":"1","generated_at":"2026-09-10T03:42:59+00:00","cve":"CVE-2026-20253","urls":{"html":"https://cve.report/CVE-2026-20253","api":"https://cve.report/api/cve/CVE-2026-20253.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20253","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20253"},"summary":{"title":"Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise","description":"In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-06-10 18:16:40","updated_at":"2026-07-23 09:10:00"},"problem_types":["CWE-306","CWE-306 The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources."],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0603","name":"https://advisory.splunk.com/advisories/SVD-2026-0603","refsource":"psirt@cisco.com","tags":["Mitigation","Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/","name":"https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/","refsource":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Third Party Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253","name":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253","refsource":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["US Government Resource"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20253","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20253","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Splunk","product":"Splunk Enterprise","version":"affected 10.2 10.2.4 custom","platforms":[]},{"source":"CNA","vendor":"Splunk","product":"Splunk Enterprise","version":"affected 10.0 10.0.7 custom","platforms":[]}],"timeline":[{"source":"ADP","time":"2026-06-18T00:00:00.000Z","lang":"en","value":"CVE-2026-20253 added to CISA KEV"}],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Alex Hordijk (hordalex)","lang":"en"}],"nvd_cpes":[{"cve_year":"2026","cve_id":"20253","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"splunk","cpe5":"splunk","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"enterprise","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":{"cve_year":"2026","cve_id":"20253","cve":"CVE-2026-20253","vendorProject":"Splunk","product":"Enterprise","vulnerabilityName":"Splunk Enterprise Missing Authentication for Critical Function Vulnerability","dateAdded":"2026-06-18","shortDescription":"Splunk Enterprise contains a missing authentication for critical function vulnerability which could allow an unauthenticated user to create or truncate arbitrary files through a PostgreSQL sidecar service endpoint.","requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","dueDate":"2026-06-21","knownRansomwareCampaignUse":"Unknown","notes":"https://advisory.splunk.com/advisories/SVD-2026-0603 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20253","cwes":"CWE-306","catalogVersion":"2026.09.09","updated_at":"2026-09-09 13:27:22"},"epss":{"cve_year":"2026","cve_id":"20253","cve":"CVE-2026-20253","epss":"0.969390000","percentile":"0.998860000","score_date":"2026-09-09","updated_at":"2026-09-10 00:06:59"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-20253","options":[{"Exploitation":"active"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-06-10T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}},{"other":{"content":{"dateAdded":"2026-06-18","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253"},"type":"kev"}}],"providerMetadata":{"dateUpdated":"2026-06-19T03:55:19.206Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"references":[{"tags":["exploit"],"url":"https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/"},{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253"}],"timeline":[{"lang":"en","time":"2026-06-18T00:00:00.000Z","value":"CVE-2026-20253 added to CISA KEV"}],"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"Splunk Enterprise","vendor":"Splunk","versions":[{"lessThan":"10.2.4","status":"affected","version":"10.2","versionType":"custom"},{"lessThan":"10.0.7","status":"affected","version":"10.0","versionType":"custom"}]}],"credits":[{"lang":"en","value":"Alex Hordijk (hordalex)"}],"datePublic":"2026-06-10T00:00:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service."}],"value":"In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","description":"The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-06-15T20:33:56.243Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0603"}],"source":{"advisory":"SVD-2026-0603"},"title":"Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20253","datePublished":"2026-06-10T17:16:21.242Z","dateReserved":"2025-10-08T11:59:15.401Z","dateUpdated":"2026-06-19T03:55:19.206Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-10 18:16:40","lastModifiedDate":"2026-07-23 09:10:00","problem_types":["CWE-306","CWE-306 The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources."],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-10T00:00:00+00:00","id":"CVE-2026-20253","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*","versionStartIncluding":"10.0.0","versionEndExcluding":"10.0.7","matchCriteriaId":"0C9F1DED-280E-4C76-A867-A7A8FCBD1F7A"},{"vulnerable":true,"criteria":"cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*","versionStartIncluding":"10.2.0","versionEndExcluding":"10.2.4","matchCriteriaId":"E3B992C0-AD5E-43A1-BAA3-6B11FFD5D750"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20253","Ordinal":"1","Title":"Unauthenticated Arbitrary File Creation and Truncation in a Post","CVE":"CVE-2026-20253","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20253","Ordinal":"1","NoteData":"In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.","Type":"Description","Title":"Unauthenticated Arbitrary File Creation and Truncation in a Post"}]}}}