CVE-2023-32721Network attack vector

Stored script execution via untrimmed Maps URL

Published Oct 12, 2023 · Updated Nov 3, 2025

Stored XSS in affected Zabbix web frontend releases allows remote authenticated users to execute JavaScript in a viewer's browser. CHtmlUrlValidator::validate removed CR, LF, and tab characters but failed to trim leading C0 controls and spaces before parse_url, allowing a crafted Maps URL to pass validation while browsers interpreted it as script-capable content. A low-privilege user must store the URL and another user must view the map, enabling session hijacking, impersonation, or browser-side actions under the viewer's privileges.

CVSS severity7.6
High
EPSS probability0.60%
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 affected Zabbix web frontend releases allows remote authenticated users to execute JavaScript in a viewer's browser. CHtmlUrlValidator::validate removed CR, LF, and tab characters but failed to trim leading C0 controls and spaces before parse_url, allowing a crafted Maps URL to pass validation while browsers interpreted it as script-capable content. A low-privilege user must store the URL and another user must view the map, enabling session hijacking, impersonation, or browser-side actions under the viewer's privileges.

The record

CVE
CVE-2023-32721
Published
Oct 12, 2023
Updated
Nov 3, 2025
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-20, CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.0.0 <=4.0.47 changes=[{"at":"4.0.48rc1","status":"unaffected"}]
  2. Affected versionversion=5.0.0 <=5.0.36 changes=[{"at":"5.0.37rc1","status":"unaffected"}]
  3. Affected versionversion=6.0.0 <=6.0.20 changes=[{"at":"6.0.21rc1","status":"unaffected"}]
  4. Affected versionversion=6.4.0 <=6.4.5 changes=[{"at":"6.4.6rc1","status":"unaffected"}]
  5. Affected versionversion=7.0.0alpha1 <=7.0.0alpha3 changes=[{"at":"7.0.0alpha4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=4.0.0 <=4.0.47 changes=[{"at":"4.0.48rc1","status":"unaffected"}]; version=5.0.0 <=5.0.36 changes=[{"at":"5.0.37rc1","status":"unaffected"}]; version=6.0.0 <=6.0.20 changes=[{"at":"6.0.21rc1","status":"unaffected"}]; version=6.4.0 <=6.4.5 changes=[{"at":"6.4.6rc1","status":"unaffected"}]; version=7.0.0alpha1 <=7.0.0alpha3 changes=[{"at":"7.0.0alpha4","status":"unaffected"}]

Published CVSS scores

7.6ZabbixCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N
5.4NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A: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-20Improper Input Validation
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

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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