CVE-2026-4818: Search-Guard Flx

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

In Search Guard FLX versions from 3.0.0 up to 4.0.1, there exists an issue which allows users without the necessary privileges to execute some management operations against data streams.

Affected products

• Search-Guard Flx: from 3.0.0, before 4.1.0 (fixed in 4.1.0)

Published 2026-03-31. Last modified 2026-07-24.