{"cve_id":"CVE-2026-20253","published":"2026-06-10T18:16:40.760000+00:00","last_modified":"2026-07-23T09:10:00.113000+00:00","vuln_status":"Analyzed","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.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-306"],"in_kev":true,"kev_date_added":"2026-06-18","kev_ransomware":false,"epss_score":0.96939,"epss_percentile":0.99888,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["AUTH_BYPASS","CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T12:16:41.254874+00:00","first_seen":"2026-06-10T18:16:40.760000+00:00","kev_first_seen":"2026-06-18T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["splunk"],"products":["splunk"],"affected":[{"vendor":"splunk","product":"splunk","ranges":["≥ 10.0.0 and < 10.0.7","≥ 10.2.0 and < 10.2.4"]}]}