Search Guard FLX <4.0.1 Data Streams Privilege Escalation
CVE-2026-4818 Published on March 31, 2026

Some management operations on data streams are not properly restricted when user does not have the necessary privileges
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.

NVD

Vulnerability Analysis

CVE-2026-4818 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Types

What is an AuthZ Vulnerability?

The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

CVE-2026-4818 has been classified to as an AuthZ vulnerability or weakness.

What is an AuthZ Vulnerability?

The software does not perform an authorization check when an actor attempts to access a resource or perform an action.

CVE-2026-4818 has been classified to as an AuthZ vulnerability or weakness.


Affected Versions

floragunn Search Guard FLX:

Exploit Probability

EPSS
0.03%
Percentile
9.52%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.