CVE-2021-38344Network attack vector

Stored XSS via unsanitized AJAX page data

Published Oct 14, 2021 · Updated Feb 14, 2025

Stored XSS in ThemeFuse Brizy - Page Builder 2.3.11 and earlier allows remote authenticated users to execute JavaScript in visitors' sessions. The brizy_update_item AJAX handler accepts JavaScript in the data parameter of a page-update request and stores it for execution when another user views or previews the page. Subscriber-level access is sufficient; code executed in an administrator's session can create an administrative user or alter plugin or theme files.

CVSS severity6.4
Medium
EPSS probability0.63%
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 ThemeFuse Brizy - Page Builder 2.3.11 and earlier allows remote authenticated users to execute JavaScript in visitors' sessions. The brizy_update_item AJAX handler accepts JavaScript in the data parameter of a page-update request and stores it for execution when another user views or previews the page. Subscriber-level access is sufficient; code executed in an administrator's session can create an administrative user or alter plugin or theme files.

The record

CVE
CVE-2021-38344
Published
Oct 14, 2021
Updated
Feb 14, 2025
Vendor
ThemeFuse
Product
Brizy - Page Builder
Classifications
CWE-79, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=2.3.11 <=2.3.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ThemeFuse · Brizy - Page Builderversion=2.3.11 <=2.3.11

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NVDCVSS: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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

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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