CVE-2026-23929Network attack vector

Stored XSS via prototype-polluted map parameters

Published Aug 18, 2026 · Updated Aug 19, 2026

Stored XSS in Zabbix Frontend Maps before 6.0.46, 7.0.25, and 7.4.9 allows remote authenticated users to inject script. The searchParamsToObject() helper accepts URL parameters into an object without blocking proto-style keys, and subsequent jQuery-based element creation on the Map page traverses the polluted prototype chain. An authenticated Zabbix user who can cause a crafted Map request can persist malicious HTML in the UI and trigger script execution when another user opens the page.

CVSS severity8.5
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Zabbix Frontend Maps before 6.0.46, 7.0.25, and 7.4.9 allows remote authenticated users to inject script. The searchParamsToObject() helper accepts URL parameters into an object without blocking proto-style keys, and subsequent jQuery-based element creation on the Map page traverses the polluted prototype chain. An authenticated Zabbix user who can cause a crafted Map request can persist malicious HTML in the UI and trigger script execution when another user opens the page.

The record

CVE
CVE-2026-23929
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-1321, CAPEC-173, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0.44 <=6.0.45 changes=[{"at":"6.0.46","status":"unaffected"}]
  2. Affected versionversion=7.0.22 <=7.0.24 changes=[{"at":"7.0.25","status":"unaffected"}]
  3. Affected versionversion=7.4.6 <=7.4.8 changes=[{"at":"7.4.9","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=6.0.44 <=6.0.45 changes=[{"at":"6.0.46","status":"unaffected"}]; version=7.0.22 <=7.0.24 changes=[{"at":"7.0.25","status":"unaffected"}]; version=7.4.6 <=7.4.8 changes=[{"at":"7.4.9","status":"unaffected"}]

Published CVSS scores

8.5ZabbixCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.5GitHub Advisory DatabaseCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC-173Pollution of Data Structure / Property Injection
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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