- Critical 9.8
- Known exploited (CISA KEV)
CVE-2026-20253
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.
Scores
The facts
- Published
- 10 June 2026
- Last changed
- 23 July 2026
- NVD status
- Analyzed
- Severity
- Critical, CVSS 9.8 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- Affects
- splunk splunk
- Known exploited
- Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 18 June 2026.
- EPSS
- 96.9% chance of exploitation activity in the next 30 days (percentile 100).
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