CVE-2021-38346Network attack vector

Authenticated code execution via path-controlled file upload

Published Oct 14, 2021 · Updated Feb 14, 2025

Unrestricted file upload in ThemeFuse Brizy - Page Builder 2.3.11 and earlier allows remote authenticated users to execute PHP code. The brizy_create_block_screenshot AJAX action base64-decodes the ibsf parameter and writes it under an id-derived path without blocking ../ traversal. Any logged-in user can place a double-extension PHP file, and execution depends on a server configuration that treats names such as shell.php.jpg as executable.

CVSS severity8.8
High
EPSS probability1.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unrestricted file upload in ThemeFuse Brizy - Page Builder 2.3.11 and earlier allows remote authenticated users to execute PHP code. The brizy_create_block_screenshot AJAX action base64-decodes the ibsf parameter and writes it under an id-derived path without blocking ../ traversal. Any logged-in user can place a double-extension PHP file, and execution depends on a server configuration that treats names such as shell.php.jpg as executable.

The record

CVE
CVE-2021-38346
Published
Oct 14, 2021
Updated
Feb 14, 2025
Vendor
ThemeFuse
Product
Brizy - Page Builder
Classifications
CWE-434, CWE-22, T1505.003
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

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=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

8.8WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NISTAV:N/AC:L/Au:S/C:P/I:P/A:P

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-434Unrestricted Upload of File with Dangerous Type
CWE-22Path Traversal
T1505.003Server Software Component: Web Shell

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo