Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Splunk | Splunk | >= 10.0.0, < 10.0.7 |
Related Weaknesses (CWE)
References
- https://advisory.splunk.com/advisories/SVD-2026-0603MitigationVendor Advisory
- https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-sExploitThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-US Government Resource
FAQ
What is CVE-2026-20253?
CVE-2026-20253 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 vulner...
How severe is CVE-2026-20253?
CVE-2026-20253 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-20253?
Check the references section above for vendor advisories and patch information. Affected products include: Splunk Splunk.