---
id: CVE-2026-4799
title: >-
  In Search Guard FLX up to version 4.0.1, it is possible to use specially
  crafted requests to redirect the user to an untrusted URL.
summary: >-
  In Search Guard FLX up to version 4.0.1, it is possible to use specially
  crafted requests to redirect the user to an untrusted URL.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-601
vendor: search-guard
product: flx
affected:
  - flx < 4.1.0
patched:
  - flx 4.1.0
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4799'
references:
  - url: 'https://docs.search-guard.com/latest/changelog-searchguard-flx-4_1_0'
    label: security@search-guard.com
  - url: 'https://search-guard.com/cve-advisory/'
    label: security@search-guard.com
tags:
  - nvd
epss: 0.00292
epssPercentile: 0.1946
ingestedAt: '2026-07-24T20:38:02.137Z'
---

## Overview

In Search Guard FLX up to version 4.0.1, it is possible to use specially crafted requests to redirect the user to an untrusted URL.

## Affected

- `flx < 4.1.0`

## Remediation

Upgrade past the affected range:

- `flx 4.1.0`