CVE-2026-23928 Zabbix CVE debrief

Who should care

Defenders responsible for Zabbix instances, especially those with user-accessible dashboards, should assess exposure and prioritize patching. Roles responsible for Zabbix instance management and dashboard access control should verify affected versions and instances, and restrict access to vulnerable dashboards to prevent unauthorized actions via injected JavaScript.

Why it matters

Defenders should care about CVE-2026-23928 because it allows injected JavaScript execution in Zabbix widgets, potentially leading to unauthorized actions. Roles responsible for Zabbix instance management and dashboard access control should assess exposure and prioritize patching. The vulnerability requires verification of affected versions and instances, and restricted access to vulnerable dashboards.

• Potential unauthorized actions via injected JavaScript
• Required verification of affected versions and instances
• Need for restricted access to vulnerable dashboards

Technical summary

The Item history widget in Zabbix 7.0+ or the Plain text widget in Zabbix 6.0 can execute injected JavaScript when HTML display is enabled. This requires the malicious JavaScript to come from a monitored host controlled by the attacker. Defenders should prioritize verifying and patching vulnerable Zabbix instances, especially those with user-accessible dashboards, and restrict access to dashboards containing these widgets to prevent unauthorized actions. The vulnerability allows injected JavaScript execution, potentially leading to unauthorized actions depending on which user opens a dashboard containing these widgets.

Defensive priority

Defenders should prioritize verifying and patching vulnerable Zabbix instances, especially those with user-accessible dashboards.

Recommended defensive actions

• Verify and apply patches for vulnerable Zabbix instances
• Restrict access to dashboards containing Item history or Plain text widgets
• Monitor for suspicious JavaScript activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including affected versions, a CVSS score of 7.3, and the need for defenders to verify and patch vulnerable Zabbix instances, especially those with user-accessible dashboards. The Item history widget in Zabbix 7.0+ or the Plain text widget in Zabbix 6.0 can execute injected JavaScript when HTML display is enabled. This requires the malicious JavaScript to come from a monitored host controlled by the attacker.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.