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CVE-2026-23920

Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection

Published: Mar 24, 2026Updated: Mar 25, 2026 Sources: CVE List NVD BDUCWE-78
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.2%
Top 84.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LC:HI:HA:H
Exploitability
AV:NAccess Vector
Network
AC:LAccess Complexity
Low
Impact
C:HConfidentiality
H
I:HIntegrity
H
A:HAvailability
H
Open in CVSS calculator →

Weaknesses

CWE-78

Affected Products

Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
ZabbixZabbix LLC.
On-premWeb App
Enterprise Software / itsm-monitoring
ZabbixZabbix
On-premDesktop App
Enterprise Software / itsm-monitoring
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «ред софт»commercialRUOperating Systemsaka red soft
zabbix llc.commercialUSEnterprise Softwareaka zabbix llc, zabbix
zabbixoss-projectSEEnterprise Software

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://redos.red-soft.ru/search/?iblock_id=24&q=CVE-2026-23920
redos.red-soft.ru
https://support.zabbix.com/browse/ZBX-27639
support.zabbix.com
https://access.redhat.com/security/cve/cve-2026-23920
access.redhat.com
and 1 more references View all →

Timeline

Published
Mar 24, 2026
Last Updated
Mar 25, 2026

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