What is CVE-2026-20253?

CVE-2026-20253 is a critical-severity vulnerability, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-06-10.

How severe is CVE-2026-20253?

Critical severity. CVSS v3 base score is 9.8 out of 10.

CVE-2026-20253

CVE-2026-20253

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.<b…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20253?: CVE-2026-20253 is a critical-severity vulnerability, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-06-10.
How severe is CVE-2026-20253?: Critical severity. CVSS v3 base score is 9.8 out of 10.