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CVE-2026-59786— Active agent heartbeat missing TLS check

Quick assessment

Affected
Zabbix Zabbix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zabbix 服务器和代理无论是否配置了预共享密钥（PSK）或证书认证，都会接受主动式代理的心跳消息。这意味着，任何能够访问 Zabbix Trapper 端口的人，都可以伪装任意主机，使其被报告为活跃的主动式代理在线状态，从而导致数据完整性受损。

CVSS 6.9 · Medium
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I. Basic Information for CVE-2026-59786

Vulnerability Information
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Vulnerability Title
Active agent heartbeat missing TLS check
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道源的不正确验证
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zabbix Zabbix 7.0.0 ~ 7.0.28 -

II. Public POCs for CVE-2026-59786

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III. Intelligence Information for CVE-2026-59786

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Other References for CVE-2026-59786 (1)

Same Patch Batch · Zabbix · 2026-10-05 · 6 CVEs total

CVE-2026-59782 6.9 MEDIUM JavaScript preprocessing memory disclosure
CVE-2026-59788 5.6 MEDIUM Stored XSS vulnerability in OAuth configuration form
CVE-2026-59787 5.3 MEDIUM SNMP trap injection in zabbix_trap_receiver.pl
CVE-2026-59785 5.1 MEDIUM Hidden host credentials inferable via multiselect.get filtering
CVE-2026-59783 2.3 LOW Server DoS via binary items

IV. Related Vulnerabilities

Same product: Zabbix
Same vendor: Zabbix
Same weakness: CWE-940

V. Comments for CVE-2026-59786

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