What’s Vulnerable › Vulnerabilities

CVE-2026-20253: Splunk Enterprise Missing Authentication for Critical Function Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-06-18
• EPSS: 96.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-10 · updated 2026-07-23
• Weakness: CWE-306

Description

In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.

Affected products

• Splunk Enterprise: from 10.0.0 before 10.0.7; from 10.2.0 before 10.2.4 — fixed in 10.0.7, 10.2.4

How to fix

Upgrade to a fixed version: Splunk Enterprise 10.0.7, 10.2.4. Check the vendor advisory for mitigations.

In the news

• Why Use App-Level Auth When Every Database Has Auth? (Splunk Enterprise CVE-2026-20253 Pre-Auth RCE)

References

• https://advisory.splunk.com/advisories/SVD-2026-0603
• https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253

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