CVE-2026-20253

{"id": "CVE-2026-20253", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20253", "role": "CISA Coordinator", "options": [{"exploitation": "active"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-10T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "psirt@cisco.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "psirt@cisco.com", "affectedData": [{"vendor": "Splunk", "product": "Splunk Enterprise", "versions": [{"status": "affected", "version": "10.2", "lessThan": "10.2.4", "versionType": "custom"}, {"status": "affected", "version": "10.0", "lessThan": "10.0.7", "versionType": "custom"}]}]}], "published": "2026-06-10T18:16:40.760", "references": [{"url": "https://advisory.splunk.com/advisories/SVD-2026-0603", "tags": ["Mitigation", "Vendor Advisory"], "source": "psirt@cisco.com"}, {"url": "https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/", "tags": ["Exploit", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253", "tags": ["US Government Resource"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-306"}]}], "descriptions": [{"lang": "en", "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."}, {"lang": "es", "value": "En las versiones de Splunk Enterprise 10.2 anteriores a la 10.2.4 y las versiones 10 anteriores a la 10.0.7, un usuario no autenticado podr\u00eda crear o truncar archivos arbitrarios a trav\u00e9s de un endpoint del servicio sidecar de PostgreSQL. La vulnerabilidad existe porque el endpoint del servicio sidecar de PostgreSQL carece de controles de autenticaci\u00f3n, lo que permite a cualquier usuario accesible por red invocar operaciones de archivo sin credenciales. Las versiones de Splunk Enterprise 9.4 y anteriores no se ven afectadas. Si no puede actualizar inmediatamente a una versi\u00f3n corregida, puede mitigar esta vulnerabilidad deshabilitando el servicio sidecar de PostgreSQL."}], "lastModified": "2026-07-23T09:10:00.113", "cisaActionDue": "2026-06-21", "cisaExploitAdd": "2026-06-18", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "0C9F1DED-280E-4C76-A867-A7A8FCBD1F7A", "versionEndExcluding": "10.0.7", "versionStartIncluding": "10.0.0"}, {"criteria": "cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "E3B992C0-AD5E-43A1-BAA3-6B11FFD5D750", "versionEndExcluding": "10.2.4", "versionStartIncluding": "10.2.0"}], "operator": "OR"}]}], "sourceIdentifier": "psirt@cisco.com", "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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.", "cisaVulnerabilityName": "Splunk Enterprise Missing Authentication for Critical Function Vulnerability"}