Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since June 18, 2026.
CVE-2026-20253
Splunk Enterprise Missing Authentication for Critical Function Vulnerability
Added to KEV June 18, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-20253
- CWE
- CWE-306
- Affected products
- Enterprise · Splunk Enterprise · Splunk
What happened
Splunk Enterprise contains a missing authentication for critical function vulnerability which could allow an unauthenticated user to create or truncate arbitrary files through a PostgreSQL sidecar service endpoint.
What it means for your business
Splunk Enterprise is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-20253). Splunk Enterprise contains a missing authentication for critical function vulnerability which could allow an unauthenticated user to create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. CISA remediation due date: 2026-06-21. PremierePC tracks KEV alerts for Upstate SC businesses — patch or open a ticket if you need help verifying exposure.
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date: June 21, 2026
Sources
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