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Vulnerability record · CVE-2026-4818 · published 31 March 2026

CVE-2026-4818: Search-guard flx improper authorization vulnerability

Search Guard · Flx

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.

8.1 CVSS 3.1 High EPSS 0.33% · top 76.5% CWE-285 · Improper authorizationCWE-862 · Missing authorization
8.1CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.search-guard.com/latest/changelog-searchguard-flx-4_1_0 Release Notes
https://search-guard.com/cve-advisory/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.5CVE-2026-4819Search-guard flx insufficiently protected credentials vulnerabilityIn Search Guard FLX versions from 1.0.0 up to 4.0.1, the audit logging feature might log user credentials from users logging into Kibana.EPSS 0.36%4.3CVE-2026-4799Search-guard flx open redirect vulnerabilityIn 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.EPSS 0.29%8.8CVE-2026-58704Android Cellular Modem improper authorization allows adjacent privilege escalationAndroid's Cellular Modem component contains a logic error that bypasses permission checks, allowing an attacker within radio/adjacent range to escala…KEVEPSS 0.59%analysed9.8CVE-2021-28799QNAP HBS 3 improper authorization allows remote loginQNAP Hybrid Backup Sync 3 (HBS 3) contains an improper authorization flaw that lets remote attackers log in to the NAS device. The issue affects mult…KEVEPSS 78%analysed

Source: NIST National Vulnerability Database (record CVE-2026-4818), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.