CVE-2026-62799.8CriticalCWE-74

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

themefusion · Avada (Fusion) Builder

Affected: themefusion Avada (Fusion) Builder · Exploitation: check available, not yet exploited

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

9.9%probability of exploitation in the next 30 days

95th percentile

050100

Higher than 95% of scored CVEs

9.8CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

themefusion · Avada (Fusion) Builderup to and including 3.15.2

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Exploitation: Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
CISA KEV: Not listed
Public check: Avada Builder (fusion-builder) <= 3.15.2 - Unauthenticated RCE via PHP Function Injection · nuclei template in projectdiscovery/nuclei-templates
Weakness: Injection · Injection and Smuggling
Vendor: themefusion
Published: May 2026
Band: Check available, not yet exploited, May 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-6279 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.