Missing Authentication for Critical Function in Splunk Enterprise - CVE-2026-20253
Published: June 12, 2026
Vulnerability identifier: #VU134461
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-20253
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Splunk Inc.
Affected software:
Splunk Enterprise
Splunk Enterprise
Detailed vulnerability description
The vulnerability allows a remote attacker to create or truncate arbitrary files.
The vulnerability exists due to improper authentication in the PostgreSQL sidecar service endpoint when handling file operation requests. A remote attacker can send crafted requests to create or truncate arbitrary files.
The endpoint can be reached without credentials.
How to mitigate CVE-2026-20253
Install security update from vendor's website.