How severe is CVE-2026-59786?

CVE-2026-59786 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-59786 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-59786?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-59786 published?

CVE-2026-59786 was published on 2026-10-05 and last updated on 2026-10-06.

CVE-2026-59786

CVE-2026-59786 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-940.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-940
Published: 2026-10-05
Last modified: 2026-10-06

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.

Frequently asked questions

What is CVE-2026-59786?: 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.
How severe is CVE-2026-59786?: CVE-2026-59786 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-59786 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-59786?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-59786 published?: CVE-2026-59786 was published on 2026-10-05 and last updated on 2026-10-06.

References

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

Other CWE-940 vulnerabilities

CVE-2025-61932 — Critical (CVSS 9.8): Lanscope Endpoint Manager (On-Premises) (Client program (MR) and Detection agent (DA)) improperly verifies the origin…
CVE-2024-38886 — Critical (CVSS 9.8): An issue in Horizon Business Services Inc. Caterease 16.0.1.1663 through 24.0.1.2405 and possibly later versions,…
CVE-2024-40515 — Critical (CVSS 9.8): An issue in SHENZHEN TENDA TECHNOLOGY CO.,LTD Tenda AX2pro V16.03.29.48_cn allows a remote attacker to execute…
CVE-2023-41355 — Critical (CVSS 9.8): Chunghwa Telecom NOKIA G-040W-Q Firewall function has a vulnerability of input validation for ICMP redirect messages.…
CVE-2026-85085 — Critical (CVSS 9.6): The Canva Android App before 2.376.0 allowed an external origin to be loaded in a privileged WebView. A threat actor…
CVE-2026-48745 — Critical (CVSS 9.3): Traccar Client is a GPS tracking mobile app for sending location updates to private servers using the open-source…

Browse all CWE-940 vulnerabilities →