CVE-2026-6279
Avada (Fusion) Builder <= 3.15.2 - Unauthenticated Remote Code Execution via PHP Function Injection via 'render_logics' Shortcode Attribute via Widget AJAX Handler
The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the `wp_conditional_tags` case in `Fusion_Builder_Conditional_Render_Helper::get_value()` passing attacker-controlled values from a base64-decoded JSON blob directly to `call_user_func()` without any allowlist validation. This is exploitable by unauthenticated attackers through the `fusion_get_widget_markup` AJAX endpoint, which is registered for non-privileged (unauthenticated) users via `wp_ajax_nopriv_fusion_get_widget_markup`. The endpoint is protected only by a nonce (`fusion_load_nonce`), but this nonce is generated for user ID 0 and is deterministically exposed in the JavaScript output of any public-facing page containing a Post Cards (`[fusion_post_cards]`) or Table of Contents (`[fusion_table_of_contents]`) element. This makes it possible for unauthenticated attackers to execute arbitrary code on affected sites.
- Affected
- themefusion · Avada (Fusion) Builder
- CVSS v3.1 WORDFENCE
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 2.39% chance of exploitation in the next 30 days, 84th percentile
- Nuclei
- critical
- Published
- 2026-05-21
Proof-of-concept exploits (5)
- zycoder0day/CVE-2026-62793★ · 2026-05-23
- 87achrafg-stack/CVE-2026-6279.py1★ · 2026-06-13
- xxconi/CVE-2026-62790★ · 2026-06-11
- 87achrafg-stack/CVE-2026-62790★ · 2026-06-13
- katranSefa/CVE-2026-62790★ · 2026-09-06