{"schema":"threatline.record/2","record":{"id":"CVE-2026-20253","aliases":[],"summary":"Splunk Enterprise Missing Authentication for Critical Function Vulnerability","details":"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.","categories":["Applications & CMS"],"product":"Enterprise","vendor":"Splunk","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-20253","source_modified_at":"2026-06-19T03:55:19.206Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Splunk Enterprise","vendor":"Splunk","versions":[{"version":"10.2","status":"affected","versionType":"custom","lessThan":"10.2.4"},{"version":"10.0","status":"affected","versionType":"custom","lessThan":"10.0.7"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-20253","source_modified_at":"2026-06-19T03:55:19.206Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Splunk Enterprise","ecosystem":null},"version":"10.2.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-20253","source_modified_at":"2026-06-19T03:55:19.206Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Splunk Enterprise","ecosystem":null},"version":"10.0.7","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2026-06-18","due_date":"2026-06-21","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.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.96939,"percentile":0.99891,"score_date":"2026-10-23"},"published_at":"2026-06-10T17:16:21.242Z","modified_at":"2026-06-19T03:55:19.206Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-20253","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-06-19T03:55:19.206Z"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-20253.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-20253","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Nuclei","EPSS"],"references":[{"source":"CVE List","url":"https://advisory.splunk.com/advisories/SVD-2026-0603"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20253","source":"CISA KEV"},{"source":"CVE List","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"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2026-06-10T00:00:00+00:00"},"exploits":[{"source":"Nuclei","kind":"Scanner template","name":"Splunk Enterprise & Cloud Platform - Unrestricted File Upload","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-20253.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-06-19T03:55:19.206Z","content_hash":"bf7d4d6b3ddeadcac7933fb85c16b42429fbed85a573893bb1176fd9207ce7a7"}}