Detections
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Zabbix Proxy 7.0.x < 7.0.29 / 7.4.x < 7.4.13 Authentication Bypass (ZBX-28196)

medium Nessus Plugin ID 364174

Synopsis

A monitoring application installed on the remote host is affected by an authentication bypass vulnerability.

Description

The version of Zabbix Proxy installed on the remote host is 7.0.x prior to 7.0.29, or 7.4.x prior to 7.4.13. It is, therefore, affected by an authentication bypass vulnerability:

 - Zabbix Server and Proxy accept the active agent heartbeat message regardless of the configured PSK or certificate authentication. This means someone with access to the Zabbix trapper port can report an arbitrary host using an active agent as available, resulting in a loss of integrity. (CVE-2026-59786)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Zabbix version 7.0.29, 7.4.13 or later.

See Also

https://support.zabbix.com/browse/ZBX-28196

Plugin Details

Severity: Medium

ID: 364174

File Name: zabbix_proxy_ZBX-28196.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 10/8/2026

Updated: 10/8/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.66

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-59786

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: x-cpe:/a:zabbix:zabbix-proxy

Required KB Items: installed_sw/Zabbix Proxy

Patch Publication Date: 10/5/2026

Vulnerability Publication Date: 10/5/2026

Reference Information

CVE: CVE-2026-59786