CISA has added CVE-2026-20253, a critical, remotely exploitable vulnerability in Splunk Enterprise, to its Known Exploited Vulnerabilities catalog, and ordered US federal civilian agencies to apply mitigations by June 21, 2026. In-the-wild exploitation has also been confirmed by the vendor and Resecurity, who said that its potential for full system compromise should push organizations to prioritize patching and review systems for indicators of compromise such as: Requests containing path traversal sequences (../) PostgreSQL connection parameters … More → The post Unauthenticated RCE in Splunk Enterprise under active attack (CVE-2026-20253) appeared first on Help Net Security .

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Splunk Enterprise flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a Splunk Enterprise flaw, tracked as CVE-2026-20253 (CVSS score of 9.8), to its Known Exploited Vulnerabilities (KEV) catalog. The flaw CVE-2026-20253 is an improper authentication vulnerability in the PostgreSQL sidecar service of […]

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-20253 Splunk Enterprise Missing Authentication for Critical Function Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies, updating BOD 22-01 . BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s Known Exploited Vulnerabilities (KEV) Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . Aware of an exploited vulnerability not curre...

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.

Splunk has released security updates to address a critical security flaw in Splunk Enterprise that could be exploited to conduct unauthenticated file operations and even remote code execution. The vulnerability, tracked as CVE-2026-20253, is rated 9.8 on the CVSS scoring system. "In Splunk Enterprise versions below 10.2.4 and 10.0.7, an unauthenticated user could create or truncate arbitrary