Description
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.
Published: 2026-10-05
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

Vendor Solution

Update the affected components to their respective fixed versions.

Tracking

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Advisories

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History

Tue, 06 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-306
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

threat_severity

Moderate


Mon, 05 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 05 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Zabbix
Zabbix zabbix
Vendors & Products Zabbix
Zabbix zabbix

Mon, 05 Oct 2026 10:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Active agent heartbeat missing TLS check
Weaknesses CWE-940
References
Metrics cvssV4_0

{'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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Zabbix

Published:

Updated: 2026-10-05T11:25:27.518Z

Reserved: 2026-07-07T08:30:49.860Z

Link: CVE-2026-59786

cve-icon Vulnrichment

Updated: 2026-10-05T11:25:18.118Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-05T11:16:59.807

Modified: 2026-10-06T15:27:05.657

Link: CVE-2026-59786

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-05T10:29:01Z

Links: CVE-2026-59786 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-05T11:30:17Z

Weaknesses
  • CWE-306

    Missing Authentication for Critical Function

  • CWE-940

    Improper Verification of Source of a Communication Channel