# CVE-2026-20253

## Summary

- **CVE ID:** CVE-2026-20253
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-306
- **Published:** Jun 10, 2026
- **Last Modified:** Jun 20, 2026

## Description

In Splunk Enterprise versions below 10.2.4 and 10.0.7, and Splunk Cloud Platform versions below 10.4.2604.3 and 10.2.2510.14, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint.<br><br>The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials.

## Affected Products

- Splunk — Splunk Enterprise (10.2)
- Splunk — Splunk Enterprise (10.0)
- Splunk — Splunk Cloud Platform (10.4.2604)
- Splunk — Splunk Cloud Platform (10.2.2510)

## References

- [CNA](https://advisory.splunk.com/advisories/SVD-2026-0603)
- [CISA-ADP](https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 96.94%
- **EPSS Percentile:** 99.9

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Jun 18, 2026
- **Due Date:** Jun 21, 2026

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._