Zabbix Server/Proxy: Heartbeat Auth Bypass (PSK/Cert)
CVE-2026-59786 Published on October 5, 2026
Active agent heartbeat missing TLS check
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.
Vulnerability Analysis
CVE-2026-59786 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Improper Verification of Source of a Communication Channel
The software establishes a communication channel to handle an incoming request that has been initiated by an actor, but it does not properly verify that the request is coming from the expected origin. When an attacker can successfully establish a communication channel from an untrusted origin, the attacker may be able to gain privileges and access unexpected functionality.
Products Associated with CVE-2026-59786
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Affected Versions
Zabbix:- Version 7.0.0, <= 7.0.28 is affected.
- Version 7.4.0, <= 7.4.12 is affected.