{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-20253: Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-20253","status":"final","version":"1","initial_release_date":"2026-06-10T17:16:21.242Z","current_release_date":"2026-06-16T13:16:55.755Z","revision_history":[{"date":"2026-06-10T17:16:21.242Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-20253 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-20253"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-20253"},{"category":"external","summary":"advisory.splunk.com","url":"https://advisory.splunk.com/advisories/SVD-2026-0603"}]},"product_tree":{"branches":[{"category":"vendor","name":"Splunk","branches":[{"category":"product_name","name":"Splunk Enterprise","branches":[{"category":"product_version_range","name":">=10.2 <10.2.4","product":{"name":"Splunk Splunk Enterprise >=10.2 <10.2.4","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:splunk:splunk_enterprise:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=10.0 <10.0.7","product":{"name":"Splunk Splunk Enterprise >=10.0 <10.0.7","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:splunk:splunk_enterprise:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-20253","title":"Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v3":{"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"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 10.0.7, 10.2.4.","product_ids":["CSAFPID-1","CSAFPID-2"]}]}]}