CVE-2026-6279

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Avada (Fusion) Builder", "vendor": "themefusion", "versions": [{"lessThanOrEqual": "3.15.2", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@wordfence.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "El plugin Avada Builder (fusion-builder) para WordPress es vulnerable a ejecuci\u00f3n remota de c\u00f3digo no autenticada a trav\u00e9s de inyecci\u00f3n de funciones PHP en versiones hasta la 3.15.2 inclusive. Esto se debe al caso 'wp_conditional_tags' en 'Fusion_Builder_Conditional_Render_Helper::get_value()' que pasa valores controlados por el atacante de un blob JSON decodificado en base64 directamente a 'call_user_func()' sin ninguna validaci\u00f3n de lista de permitidos. Esto es explotable por atacantes no autenticados a trav\u00e9s del endpoint AJAX 'fusion_get_widget_markup', que est\u00e1 registrado para usuarios no privilegiados (no autenticados) a trav\u00e9s de 'wp_ajax_nopriv_fusion_get_widget_markup'. El endpoint est\u00e1 protegido solo por un nonce ('fusion_load_nonce'), pero este nonce se genera para el ID de usuario 0 y se expone de forma determinista en la salida de JavaScript de cualquier p\u00e1gina p\u00fablica que contenga un elemento Post Cards ('[fusion_post_cards]') o Table of Contents ('[fusion_table_of_contents]'). Esto hace posible que atacantes no autenticados ejecuten c\u00f3digo arbitrario en los sitios afectados."}], "id": "CVE-2026-6279", "lastModified": "2026-07-23T15:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "security@wordfence.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6279", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-21T12:22:05.314059Z", "version": "2.0.3"}}]}, "published": "2026-05-21T05:16:23.770", "references": [{"source": "security@wordfence.com", "url": "https://avada.com/documentation/avada-changelog/"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/tags/3.15.0/inc/class-fusion-builder.php#L7551"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/tags/3.15.0/inc/helpers/class-fusion-builder-conditional-render-helper.php#L1083"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/tags/3.15.0/inc/helpers/class-fusion-builder-conditional-render-helper.php#L1531"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/tags/3.15.0/shortcodes/fusion-widget.php#L389"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/tags/3.15.0/shortcodes/fusion-widget.php#L44"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/trunk/inc/class-fusion-builder.php#L7551"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/trunk/inc/helpers/class-fusion-builder-conditional-render-helper.php#L1083"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/trunk/inc/helpers/class-fusion-builder-conditional-render-helper.php#L1531"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/trunk/shortcodes/fusion-widget.php#L389"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/fusion-builder/trunk/shortcodes/fusion-widget.php#L44"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/5dc72d78-d47c-4b36-8d69-8672e15ddf8c?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-74"}], "source": "security@wordfence.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,3.15.2]"}}], "enrichment": {"confidence": 87.0, "confidence_source": "matching", "scores": [{"score": 87.0, "source": "matching"}]}, "original": {"product": "Avada (Fusion) Builder", "source": "cna", "vendor": "themefusion"}, "product": "fusion_builder", "vendor": "themefusion"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "wordpress", "vendor": "wordpress"}], "created": "2026-05-21T07:00:04.892821+00:00", "updated": "2026-10-25T19:30:14.994431+00:00", "vendors": ["themefusion", "themefusion$PRODUCT$fusion_builder", "wordpress", "wordpress$PRODUCT$wordpress"]}