{"cve":{"cve_id":"CVE-2026-20253","is_kev":true,"kev_date_added":"2026-06-18","kev_vendor_project":"Splunk","kev_product":"Enterprise","kev_vulnerability_name":"Splunk Enterprise Missing Authentication for Critical Function Vulnerability","kev_short_description":"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.","kev_required_action":"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.","kev_due_date":"2026-06-21","kev_known_ransomware":false,"kev_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","kev_cwes":["CWE-306"],"epss_score":0.921,"epss_percentile":0.99807,"epss_as_of":"2026-06-23","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.","published_at":"2026-06-10T17:16:21.242000Z","last_modified_at":null,"cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-306"],"nvd_references":["https://advisory.splunk.com/advisories/SVD-2026-0603"],"vuln_status":null,"trending_score":0.6611714338622685,"is_trending":true,"has_trended":true,"trended_number_one":false,"trending_peak_score":0.6611714338622685,"trending_peak_rank":2,"started_trending_at":"2026-06-29T02:30:27.366045Z","trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-29T02:30:27.550645Z"},"effective_severity":"CRITICAL","badges":["kev","poc","trending","epss"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"splunk","vendor_name":"Splunk","product_slug":"splunk-enterprise","product_name":"Splunk Enterprise","version_start":"10.2","version_start_inclusive":true,"version_end":"10.2.4","version_end_inclusive":false,"cpe23_uri":"cve5:splunk:splunk-enterprise:10.2:10.2.4"},{"vendor_slug":"splunk","vendor_name":"Splunk","product_slug":"splunk-enterprise","product_name":"Splunk Enterprise","version_start":"10.0","version_start_inclusive":true,"version_end":"10.0.7","version_end_inclusive":false,"cpe23_uri":"cve5:splunk:splunk-enterprise:10.0:10.0.7"}],"exploit_refs":[{"source":"nuclei","kind":"nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-20253.yaml","title":"Splunk Enterprise & Cloud Platform - Unrestricted File Upload","author":"watchtowrlabs,DhiyaneshDk","disclosed_at":null}],"news":[],"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0603","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-06-10T17:16:21.242000Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2026-06-18T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"poc_available","at":"2026-06-24T00:29:48.638073Z","label":"Public PoC available","source":"nuclei"},{"type":"cvss_changed","at":"2026-06-28T17:50:54.673227Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:50:54.673227Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:50:54.673227Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"started_trending","at":"2026-06-29T02:30:27.366045Z","label":"Started trending","source":null}]}