Unauthenticated Remote Code Execution Vulnerability in Avada Builder Plugin for WordPress
CVE-2026-6279

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Avada (fusion) Builder
Vendor
CVE Published:
21 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6279?

The Avada Builder (fusion-builder) plugin for WordPress is susceptible to a Remote Code Execution vulnerability that allows unauthenticated attackers to exploit the system via PHP Function Injection. This issue arises from a flaw in the handling of attacker-controlled input within the Fusion_Builder_Conditional_Render_Helper::get_value() function. When the fusion_get_widget_markup AJAX endpoint is called, the lack of proper allowlist validation permits malicious users to execute arbitrary code on vulnerable websites, compromising security. The vulnerability is exacerbated as the nonce validation is weak, exposing it through the public-facing pages utilizing specific shortcode elements.

Affected Version(s)

Avada (Fusion) Builder 0 <= 3.15.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-6279
Created by zycoder0day

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/fusion-builder...
https://plugins.trac.wordpress.org/browser/fusion-builder...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tin Pham
Trong Pham
Hao Ngo
.