Vulnerability Description
The Avada theme for WordPress is vulnerable to Arbitrary File Write in all versions up to, and including, 7.16 when the Fusion Builder plugin is installed and active in versions up to, and including, 3.16. This is due to a chain of authorization and input validation weaknesses across the two components that makes it possible for unauthenticated attackers to write attacker-controlled files to the server. This can be used to create and execute arbitrary PHP files, resulting in remote code execution and complete site compromise. Successful exploitation requires both Avada and Fusion Builder to be installed and active, as well as certain administrator-authored content to be present.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://avada.com/documentation/avada-changelog/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5bef5bd3-8ec9-4a5b-bcd
FAQ
What is CVE-2026-18431?
CVE-2026-18431 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The Avada theme for WordPress is vulnerable to Arbitrary File Write in all versions up to, and including, 7.16 when the Fusion Builder plugin is installed and active in versions up to, and including, ...
How severe is CVE-2026-18431?
CVE-2026-18431 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-18431?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.