CVE-2026-23920
highpriority · track · 35EPSS 0.003 · 24 %ileDEEURUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.2–8.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (24)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-0857Zabbix: Mehrere SchwachstellenDeutsch2026-03-24csaf · cert_bundDE
Ein Angreifer aus einem angrenzenden Netzwerk kann mehrere Schwachstellen in Zabbix ausnutzen, um Informationen offenzulegen, um Shell-Befehle einschleusen, um eine SQL Injection durchzuführen und um einen Denial of Service zu verursachen.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (6)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-23920cnnvd
- https://support.zabbix.com/browse/ZBX-27639cnnvd
- https://vigilance.fr/vulnerability/Zabbix-code-execution-via-Host-Event-Action-Script-50166cnnvd
- https://www.zabbix.com/downloadPatchcnnvd
- https://support.zabbix.com/browse/ZBX-27639enisa_euvd
- https://support.zabbix.com/browse/ZBX-27639Vendor Advisorynvd
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