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Type:
Defect (Security)
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Resolution: Fixed
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Priority:
Major
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None
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Affects Version/s: None
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Component/s: Proxy (P), Server (S)
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None
| CVE ID | CVE-2026-59786 |
| CVSS score | 6.9 (Medium) |
| CVSS vector | 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 |
| Affected components | Server, Proxy |
| Summary | Active agent heartbeat missing TLS check |
| 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. |
| Known attack vectors | Attacker with network access to the trapper port sending crafted heartbeat packets. |
| Affected and fix version/s | Affected: 7.0.0 - 7.0.28 → Fixed: 7.0.29 Affected: 7.4.0 - 7.4.12 → Fixed: 7.4.13 |
| Mitigation | Update the affected components to their respective fixed versions. |
| Workarounds | - |
| Acknowledgements | Zabbix wants to thank Aditya Bisht for submitting this report on the HackerOne bug bounty platform. |