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

criticalknown exploitedpublic exploitCVE-2026-20253
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Splunkproduct: Splunk EnterpriseAuthentication bypass
What
A missing authentication vulnerability allows unauthenticated users to create or truncate files.
Who is affected
Users of Splunk Enterprise.
Urgency
Remediation is critical as exploitation is possible and the vulnerability is severe.
Action
Update to the latest version of Splunk Enterprise.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-06-18
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-20253

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-20253coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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