Horizon Alert
Summary of the vulnerability and why it matters
A critical vulnerability exists in the Avada theme and Fusion Builder plugin for WordPress, allowing unauthenticated attackers to write arbitrary files to the server, potentially leading to remote code execution and full site compromise. This threat requires both components to be installed and active, along with specific administrator-authored content.
- Attackers can write files and run code.
- High risk of site compromise with active theme/plugin.
- Confirm relevance and check for exposure.
Attack Path
How an attacker could exploit the issue
An attacker could initiate an attack without any authentication by exploiting weaknesses in the Avada theme and Fusion Builder plugin. This allows them to write arbitrary files to the server, which can then be used to execute PHP code, leading to full control of the website. The attack is possible when both the Avada theme and Fusion Builder plugin are installed and active, and if specific content created by an administrator is present on the site.
- No authentication required.
- Write arbitrary files via plugin and theme.
- Remote code execution and site compromise.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows unauthenticated attackers to write arbitrary files to the server when the Avada theme and Fusion Builder plugin are installed and active, and specific administrator-authored content is present. This could lead to the creation and execution of malicious PHP files, potentially resulting in remote code execution and full website compromise.
- Server files and website integrity.
- Uploading crafted files via a chain of weaknesses.
- Remote code execution and site compromise.
Operational Fix
Recommended remediation, mitigation, and detection steps
Attackers can exploit this vulnerability to execute arbitrary code on your WordPress site by chaining weaknesses in the Avada theme and Fusion Builder plugin. The first practical step is to determine if both components are installed and active, identify the specific content that might enable exploitation, and confirm the business criticality of the affected site. Once confirmed, work with your platform and security teams to plan remediation, considering the need for vendor coordination if the vulnerability resides within the themes or plugins themselves.
- Theme and plugin owners should address this.
- Verify active Avada and Fusion Builder installations.
- Plan coordinated theme/plugin updates.
