CVE-2026-20253
Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
KEVCRITICAL 9.8EPSS 96.9%
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.
- Affected
- Splunk · Splunk Enterprise
- CVSS v3.1 CISCO
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 96.94% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2026-06-18
- Nuclei
- critical
- Published
- 2026-06-10
- Updated
- 2026-06-19
Proof-of-concept exploits (7)
- watchtowrlabs/watchTowr-vs-Splunk-CVE-2026-2025313★ · 2026-06-12
- pssec-io/CVE-2026-202530★ · 2026-06-29
- HORKimhab/CVE-2026-202530★ · 2026-06-14
- fevar54/CVE-2026-20253-Splunk-Enterprise-Pre-Auth-RCE-0★ · 2026-06-26
- Het-Kalariya/CVE-2026-202530★ · 2026-07-18
- 0xBlackash/CVE-2026-202535★ · 2026-06-13
- ivanesk315/CVE-2026-202530★ · 2026-09-10
Nuclei templates (1)
Security advisories
- https://advisory.splunk.com/advisories/SVD-2026-0603
- https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-ent…