All vulnerabilities
CVE-2026-20253

Splunk Enterprise Missing Authentication for Critical Function Vulnerability

Splunk EnterpriseApplications & CMS
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationExploited in the wildAdded to KEV 18 Jun 2026CISA KEV
Exploit odds (EPSS)96.9%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.2.4Also 10.0.7CVE List
Federal deadline21 Jun 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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 KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 10 Jun 2026, 17:16 UTCPublishedCVE List
  2. 18 Jun 2026Added to CISA KEVCISA KEV

Public exploit code and templates 1

  • Scanner templateSplunk Enterprise & Cloud Platform - Unrestricted File UploadNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

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.

Text from CVE List

Affected versions 2

  • Splunk Enterpriseaffected: 10.2 before 10.2.4CVE List
  • Splunk Enterpriseaffected: 10.0 before 10.0.7CVE List

References 4