SB2026081859 - Multiple vulnerabilities in Zabbix

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Main Vulnerability Database SB2026081859

SB2026081859 - Multiple vulnerabilities in Zabbix

Published: August 18, 2026

Security Bulletin ID SB2026081859
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Prototype pollution (CVE-ID: CVE-2026-23929)

CWE-ID: CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes (\'Prototype Pollution\')

CVSSv4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to execute arbitrary script code in the victim's browser.

The vulnerability exists due to prototype pollution in searchParamsToObject() in the frontend Map page when processing URL parameters. A remote user can inject malicious HTML into the Zabbix UI to execute arbitrary script code in the victim's browser.

The issue results in stored cross-site scripting and requires user interaction.


2) Improper access control (CVE-ID: CVE-2026-23922)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to improper access control in the email media OAuth client secret field in the frontend when changing the token endpoint. A remote privileged user can set a malicious token endpoint to disclose sensitive information.

The issue affects the email media OAuth configuration workflow.


Remediation

Install update from vendor's website.

References