Executive brief
Zabbix Frontend is a web-based monitoring and alerting system used by organizations to track infrastructure health and performance. An unauthenticated attacker can send specially crafted HTTP requests to trigger excessive CPU consumption on the web server, causing service degradation or outages without needing valid credentials or user interaction.
Technical details
This is a denial-of-service (DoS) vulnerability in the Zabbix Frontend's popup.testtriggerexpr action handler. The vulnerability allows unauthenticated attackers to send specifically crafted HTTP requests that cause disproportionate CPU load on the frontend web server. The attack is network-accessible and requires no authentication, credentials, or user interaction. A successful exploit results in potential service unavailability or performance degradation. The issue has been patched in versions 6.0.47, 7.0.27, and 7.4.11.
Affected products
- Zabbix Zabbix Frontend 6.0.0-6.0.46, 7.0.0-7.0.26, 7.4.0-7.4.10
Timeline
- 2026-08-18: disclosed: CVE-2026-23930 published
- 2026-08-18: patched: Fixed in versions 6.0.47, 7.0.27, and 7.4.11