CVE-2026-59786

Active agent heartbeat missing TLS check

State: Published
Severity: 6.9 Medium
Published: Oct 5, 2026
Updated: Oct 5, 2026
Reserved: Jul 7, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	Zabbix

Weaknesses

CWE-940 Improper Verification of Source of a Communication Channel

Affected Products

Product	Versions
ZabbixZabbix	7.0.0 through 7.0.28Affectedfrom 7.0.29Not affected 7.4.0 through 7.4.12Affectedfrom 7.4.13Not affected

References

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

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.