Vulnerability · Published Mar 24, 2026 · Assigned by Zabbix
CVE-2026-23920Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection
High 7.7
In plain English
A high-severity OS command injection in Zabbix from Zabbix. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)7.7High
Exploit odds (30 days)0.3%top 76.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zabbix | no fix listed | DEBIAN-CVE-2026-23920 |
| Debian:13 | zabbix | 1:7.0.22+dfsg-1~deb13u1 | DEBIAN-CVE-2026-23920 |
| Debian:14 | zabbix | 1:7.0.22+dfsg-1 | DEBIAN-CVE-2026-23920 |
| Ubuntu:25.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23920 |
Affected products (as reported)
Weakness: CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N