Answer in brief
CVE-2026-18431 records a Critical severity (CVSS 9.8) vulnerability in Avada <= 7.16 and Fusion Builder <= 3.16 - Unauthenticated Remote Code Execution via Arbitrary File Write. The current sources do not mark it as known exploited. The current feed maps themefusion/Avada (Fusion) Builder (generic), themefusion/Avada (Fusion) Builder (generic), ThemeFusion/Avada | Website Builder For WordPress & WooCommerce (generic), ThemeFusion/Avada | Website Builder For WordPress & WooCommerce (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps themefusion/Avada (Fusion) Builder (generic), themefusion/Avada (Fusion) Builder (generic), ThemeFusion/Avada | Website Builder For WordPress & WooCommerce (generic), ThemeFusion/Avada | Website Builder For WordPress & WooCommerce (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| themefusion/Avada (Fusion) Buildergeneric | >=0 <=3.16 | Not reported |
| themefusion/Avada (Fusion) Buildergeneric | 0 | Not reported |
| ThemeFusion/Avada | Website Builder For WordPress & WooCommercegeneric | >=0 <=7.16 | Not reported |
| ThemeFusion/Avada | Website Builder For WordPress & WooCommercegeneric | 0 | Not reported |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.