Medium severity · published Aug 18, 2026
CVE-2026-23935
Use-after-free read in script item/preprocessing HttpRequest body
4.9
CVSS
0.5%
EPSS
No
On KEV
Description
A Zabbix administrator is able to read out of bounds memory by utilizing a flaw in script item/preprocessing (JavaScript) HttpRequest logic, leading to potential confidentiality loss.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
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
7.0.0 through 7.0.27; 7.4.0 through 7.4.11 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23935
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23935
Vendor Advisory
https://support.zabbix.com/browse/ZBX-28073
More from Zabbix
9.8
CVE-2022-23131
Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML
5.3
CVE-2022-23134
Possible view of the setup pages by unauthenticated users if config file already exists
9.9
CVE-2024-42327
A non-admin user account on the Zabbix frontend with the default User role, or with any other role that gives API access can exploit this vulnerability
9.8
CVE-2022-43516
A Firewall Rule which allows all incoming TCP connections to all programs from any source and to all ports is created in Windows Firewall after Zabbix agent installation (MSI)
9.8
CVE-2020-11800
Zabbix Server 2.2.x and 3.0.x before 3.0.31, and 3.2 allows remote attackers to execute arbitrary code