Vulnerability Report

CVE-2026-20253

CISA KEV Active

Title: Arbitrary File Operations in PostgreSQL Sidecar Service

Auth Bypass

Proof Of Concept

PoC Available for CVE-2026-20253

CWE Category CWE-306

Published Date Jun 10, 2026

Modified Date Jun 19, 2026

Exploit Status Available

Score 9.8 CVSS v3.1

Exploit Probability (EPSS)

10.03%

Vulnerability Summary

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.

Impacted Vendors

splunk 1

jenkins 1

Reference Links

https://advisory.splunk.com/advisories/SVD-2026-0603

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-20253 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/watchtowrlabs/watchTowr-vs-Splunk-CVE-2026-20253

View Code

GitHub https://github.com/0xBlackash/CVE-2026-20253

View Code

GitHub https://github.com/HORKimhab/CVE-2026-20253

View Code

June 19, 2026 MODIFIED