KEV / Record
CVE-2026-20253: Splunk Enterprise Missing Authentication for Critical Function Vulnerability
Answer CVE-2026-20253 is in CISA's Known Exploited Vulnerabilities catalog. It was added on 2026-06-18, and US federal civilian agencies must act on it by 2026-06-21.
DCISA description
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.
ARequired 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.
RNotes and references
https://advisory.splunk.com/advisories/SVD-2026-0603 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20253
FRecord
- CVE
- CVE-2026-20253
- Vendor
- Splunk (1 entry in KEV)
- Product
- Enterprise (1 entry)
- Added to KEV
- Federal due date
- Past due date (2026-06-21)
- Remediation window
- 3 days
- Known ransomware use
- Unknown (not confirmed by CISA)
This record repeats CISA's entry and is excluded from search indexes until an analyst note is added.
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23.