Active agent heartbeat missing TLS check

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59786
StatePUBLISHED
AssignerZabbix
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-05 11:16:59 UTC
Updated2026-10-06 15:27:05 UTC
DescriptionZabbix 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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002030000 probability, percentile 0.093830000 (date 2026-10-06)

Problem Types: CWE-940 | CWE-940 CWE-940: Improper Verification of Source of a Communication Channel

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zabbix Zabbix affected 7.0.0 7.0.28 git Not specified
CNA Zabbix Zabbix affected 7.4.0 7.4.12 git Not specified

References

ReferenceSourceLinkTags
support.zabbix.com/browse/ZBX-28196 [email protected] support.zabbix.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zabbix wants to thank Aditya Bisht for submitting this report on the HackerOne bug bounty platform. (en)

Additional Advisory Data

Solutions

CNA: Update the affected components to their respective fixed versions.

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