SEPTEMBER 17, 2026
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Case File

CVE-2026-18431

CRITICAL · CVSS 9.8 EPSS 0.64% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-26 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The Avada theme for WordPress, when paired with the Fusion Builder plugin, is vulnerable to arbitrary file write, allowing unauthenticated attackers to upload and execute malicious PHP files on the server. This critical vulnerability can lead to remote code execution and full site compromise, making it imperative for users of both the Avada theme and Fusion Builder plugin to prioritize immediate patching and mitigation efforts. Site administrators and security teams managing WordPress installations with these components should take urgent action to protect their environments.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit remote code execution code execution

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-18431
Severity
CRITICAL
CVSS
9.8
EPSS
0.64%
WordPress

Original NVD 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.