Exploited vulnerability

CVE-2026-20253

TLP:CLEAR

Splunk Enterprise Missing Authentication for Critical Function Vulnerability

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.

Facts

Vendor: Splunk
Product: Enterprise
CVSS: 9.8
EPSS (probability of exploitation within 30 days): 96.9 %
On CISA's Known Exploited Vulnerabilities list since: 18 June 2026
First known exploitation: 18 June 2026
CISA's deadline for US federal agencies: 21 June 2026
Weakness: CWE-306
First seen by Risk Letters: 10 June 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD