zabbix: Host and event action script input is validated with a regex (set by the administrator), but the validation runs in m...
CVE-2026-23920 is fixed in zabbix on 1 platform, first by DEBIAN-CVE-2026-23920, released March 24, 2026. It is not reported as exploited. Patch Radar priority: High.
Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| zabbix · Debian 13.5 (trixie) | 1:7.0.22+dfsg-1~deb13u1 | DEBIAN-CVE-2026-23920 | Mar 24, 2026 |
| zabbix · Debian 14 | 1:7.0.22+dfsg-1 | DEBIAN-CVE-2026-23920 | Mar 24, 2026 |
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