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CVE-2026-59786

Active agent heartbeat missing TLS check

MEDIUM
6.9
CVSS Score
Published: October 5, 2026 at 10:29 AM UTC
Updated: October 6, 2026 at 03:27 PM UTC
1 product affected across 1 vendorZabbix

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zabbix· Zabbix
60%
7.0.0 ≤ v ≤ 7.0.287.4.0 ≤ v ≤ 7.4.127.0.07.4.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMZabbix
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-940

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