Vulnerability Details CVE-2026-20253
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.962
EPSS Ranking 99.9%
CVSS Severity
CVSS v3 Score 9.8
Proposed Action
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.
Ransomware Campaign
Unknown
References
Products affected by CVE-2026-20253
-
cpe:2.3:a:splunk:splunk:10.0.0
-
cpe:2.3:a:splunk:splunk:10.0.1
-
cpe:2.3:a:splunk:splunk:10.0.2
-
cpe:2.3:a:splunk:splunk:10.0.3
-
cpe:2.3:a:splunk:splunk:10.0.4
-
cpe:2.3:a:splunk:splunk:10.0.5
-
cpe:2.3:a:splunk:splunk:10.2.0
-
cpe:2.3:a:splunk:splunk:10.2.1
-
cpe:2.3:a:splunk:splunk:10.2.2