| Name | CVE-2026-23920 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| zabbix (PTS) | bullseye | 1:5.0.8+dfsg-1 | vulnerable |
| bullseye (security) | 1:5.0.47+dfsg-0+deb11u1 | vulnerable |
| bookworm | 1:6.0.14+dfsg-1 | vulnerable |
| trixie | 1:7.0.22+dfsg-1~deb13u1 | fixed |
| forky, sid | 1:7.0.22+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| zabbix | source | trixie | 1:7.0.22+dfsg-1~deb13u1 | | | |
| zabbix | source | (unstable) | 1:7.0.22+dfsg-1 | | | |
Notes
[bookworm] - zabbix <ignored> (The WEB UI is only supported for access by trusted users, no security updates issued for it, #1124558)
https://support.zabbix.com/browse/ZBX-27639