CVE-2026-12256 | BDVDB-2026-340692 Detail

ThemeFusionFusion Builder

Description#

Deserialization of Untrusted Data vulnerability in ThemeFusion Fusion Builder fusion-builder allows Object Injection.This issue affects Fusion Builder: from n/a through 3.15.3.

Impact#

Object Injection

Weaknesses#

CWE-502 Deserialization of Untrusted Data

References#

https://patchstack.com/database/wordpress/plugin/fusion-builder/vulnerability/wordpress-avada-theme-3-15-3-php-object-injection-vulnerability?_s_id=cve

Exploit#

No public exploit known

History#

Version 12026-06-16Record published in the CVE List.
Version 22026-10-01Most recent update recorded in the CVE List.

Published

Published: 2026-06-16
Last modified: 2026-10-01

Vendor information

Vendor: ThemeFusion
Product: Fusion Builder

All ThemeFusion vulnerabilities

Score

8.8 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 40.9.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Insecure Deserialization

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
<= 3.15.3
Fixed
Not stated
Vulnerable
Not stated
Fixed
3.15.4

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.8 High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).