Medium severity · published Aug 18, 2026
CVE-2026-23938
Server DoS via JavaScript preprocessing or script items
4.9
CVSS
0.5%
EPSS
No
On KEV
Description
An authenticated administrator is able to crash Zabbix server or proxy by creating specifically crafted preprocessing/script item JavaScript scripts, leading to potential denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZA
Zabbix · Zabbix
6.0.0 through 6.0.46; 7.0.0 through 7.0.26; 7.4.0 through 7.4.10 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23938
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23938
Vendor Advisory
https://support.zabbix.com/browse/ZBX-28075
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