CVE-2026-6279Network attack vector

Unauthenticated code execution via unchecked PHP callback

Published May 21, 2026 · Updated May 21, 2026

PHP function injection in ThemeFusion Avada Builder 3.15.2 and earlier allows remote attackers to execute arbitrary code through AJAX. Fusion_Builder_Conditional_Render_Helper::get_value() base64-decodes render_logics JSON and passes its wp_conditional_tags value to call_user_func() without an allowlist. The unauthenticated fusion_get_widget_markup route is reachable when a public page exposes its user-ID-0 nonce through a Post Cards or Table of Contents element, granting code execution in the WordPress process.

CVSS severity9.8
Critical
EPSS probability3.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP function injection in ThemeFusion Avada Builder 3.15.2 and earlier allows remote attackers to execute arbitrary code through AJAX. Fusion_Builder_Conditional_Render_Helper::get_value() base64-decodes render_logics JSON and passes its wp_conditional_tags value to call_user_func() without an allowlist. The unauthenticated fusion_get_widget_markup route is reachable when a public page exposes its user-ID-0 nonce through a Post Cards or Table of Contents element, granting code execution in the WordPress process.

The record

CVE
CVE-2026-6279
Published
May 21, 2026
Updated
May 21, 2026
Vendor
ThemeFusion
Product
Avada Builder
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 2026Record 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=0 <=3.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThemeFusion · Avada Builderversion=0 <=3.15.2

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
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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