CVE-2026-20253

critical

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.

References

https://www.securityweek.com/splunk-enterprise-vulnerability-exploited-in-attacks-days-after-disclosure/

https://www.helpnetsecurity.com/2026/06/19/splunk-vulnerability-cve-2026-20253-exploited/

https://www.bleepingcomputer.com/news/security/cisa-splunk-enterprise-flaw-actively-exploited-patch-by-sunday/

https://securityaffairs.com/193888/security/u-s-cisa-adds-splunk-enterprise-flaw-to-its-known-exploited-vulnerabilities-catalog-and-urges-agencies-to-fix-it-by-sunday.html

https://www.cisa.gov/news-events/alerts/2026/06/18/cisa-adds-one-known-exploited-vulnerability-catalog

https://thehackernews.com/2026/06/critical-splunk-enterprise-flaw-lets.html

https://www.securityweek.com/splunk-palo-alto-networks-patch-severe-vulnerabilities/

https://github.com/cyberupdates365/ai-cyber-threats-and-cve-mitigation-tracker-2026

https://github.com/Het-Kalariya/CVE-2026-20253

https://github.com/the-artist111/NeuralReaper

https://github.com/shunfeng8421/exploit-library

https://github.com/VixianSchool/nuclei-cve-check

https://github.com/reactivezero/CVE-2026-20251

https://github.com/HORKimhab/CVE-2026-20253

https://github.com/0xBlackash/CVE-2026-20253

https://github.com/watchtowrlabs/watchTowr-vs-Splunk-CVE-2026-20253

https://github.com/intelseclab/poc-archive

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253

https://advisory.splunk.com/advisories/SVD-2026-0603

Details

Source: Mitre, NVD

Published: 2026-06-10

Updated: 2026-07-23

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.96939

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics