# CVE-2026-23930: Zabbix Frontend denial of service via popup.testtriggerexpr

Source: https://junglewise.ai/threats/cve-2026-23930-zabbix-frontend-denial-of-service-via-popup-testtriggerexpr  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-23930 · Severity: high · CVSS 7.5 · Published 2026-08-18

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.

Technologies: [Zabbix Frontend](https://junglewise.ai/threats/technologies/frontend). Vendors: [Zabbix](https://junglewise.ai/threats/vendors/zabbix).

## Quick answers

**Is CVE-2026-23930 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-23930 being exploited in the wild.

**How severe is CVE-2026-23930?** High severity, with a CVSS score of 7.5, published 18 August 2026.

**Which products and versions are affected?** Zabbix Frontend 6.0.0-6.0.46, 7.0.0-7.0.26, 7.4.0-7.4.10.

**Is there a fix for CVE-2026-23930?** A patch was published on 2026-08-18: Fixed in versions 6.0.47, 7.0.27, and 7.4.11 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-23930 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-23930?** Check whether you run Zabbix Frontend at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## 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

## References

- [https://support.zabbix.com/browse/ZBX-28069](https://support.zabbix.com/browse/ZBX-28069)

## Related threats

- [Zabbix Frontend session key disclosure in database](https://junglewise.ai/threats/cve-2026-23933-zabbix-frontend-session-key-disclosure-in-database)
- [Zabbix Frontend plaintext macro value enumeration](https://junglewise.ai/threats/cve-2026-23931-zabbix-frontend-plaintext-macro-value-enumeration)