CVE-2026-20253: listed in the CISA KEV catalog

CVE-2026-20253 · CVSS 9.8 CRITICAL · EPSS 97% · KEV 2026-06-18

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.

Is CVE-2026-20253 exploited?

• Listed in the CISA KEV catalog on 2026-06-18.
• Federal remediation due 2026-06-21.
• Past that date by 55 days.
• EPSS puts exploitation in the next 30 days at 97%.
• Public exploit code: none found in monitored sources.
• Public detection rules exist.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2026-20253

• Splunk’s Control Plane Is Now the Target (2026-06-14)
• Patches Leave Dependency Risk Behind (2026-06-12)

Primary sources

• NVD record
• CISA KEV catalog
• Nuclei template

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.