CVE-2026-20253
Splunk Enterprise Missing Authentication for Critical Function Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-06-18. Federal due date: 2026-06-21.
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.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Splunk | Splunk | from 10.0.0 before 10.0.7 from 10.2.0 before 10.2.4 |
Weakness classification
References
- NVD record
- CVE.org record
- CISA KEV catalog
- https://advisory.splunk.com/advisories/SVD-2026-0603
- https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253