CVE-2026-23929 PUBLISHED

Prototype pollution leading to stored XSS

Assigner: Zabbix
Reserved: 19.01.2026 Published: 18.08.2026 Updated: 19.08.2026

Prototype pollution vulnerability in searchParamsToObject() is leading to a persistent XSS in Maps. URL parameter processing was not filtering dangerous properties like proto, combined with jQuery's unsafe element creation that traversed the prototype chain.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.5

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	Active

CVSS 4.0

Product Status

Vendor	Zabbix
Product	Zabbix
Versions	Default: unknown affected from 6.0.44 to 6.0.45 (incl.) affected from 7.0.22 to 7.0.24 (incl.) affected from 7.4.6 to 7.4.8 (incl.)

Affected Configurations

An authenticated Zabbix user could inject the malicious HTML into the Zabbix UI (Map page).

Solutions

Update the affected components to their respective fixed versions.

Credits

Zabbix wants to thank Perce, 6o_o9 and Nassim BETTACH @Shenron for submitting this report on the HackerOne bug bounty platform. reporter

References

https://support.zabbix.com/browse/ZBX-28068

Problem Types

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ("Prototype Pollution") CWE

Impacts

CAPEC-173: Pollution of Data Structure / Property Injection