CVE-2026-3475

{"id": "CVE-2026-3475", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "security@wordfence.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "published": "2026-03-19T08:16:19.327", "references": [{"url": "https://plugins.trac.wordpress.org/browser/instant-popup-builder/tags/1.1.6/public/class-instant-popup-subscription-public.php#L1761", "source": "security@wordfence.com"}, {"url": "https://plugins.trac.wordpress.org/browser/instant-popup-builder/tags/1.1.6/public/class-instant-popup-subscription-public.php#L1772", "source": "security@wordfence.com"}, {"url": "https://plugins.trac.wordpress.org/browser/instant-popup-builder/trunk/public/class-instant-popup-subscription-public.php#L1761", "source": "security@wordfence.com"}, {"url": "https://plugins.trac.wordpress.org/browser/instant-popup-builder/trunk/public/class-instant-popup-subscription-public.php#L1772", "source": "security@wordfence.com"}, {"url": "https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3477334%40instant-popup-builder&new=3477334%40instant-popup-builder&sfp_email=&sfph_mail=", "source": "security@wordfence.com"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/979962e3-9052-4dc9-94d0-3ec8de3d5460?source=cve", "source": "security@wordfence.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Primary", "source": "security@wordfence.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "The Instant Popup Builder plugin for WordPress is vulnerable to Unauthenticated Arbitrary Shortcode Execution in all versions up to and including 1.1.7. This is due to the handle_email_verification_page() function constructing a shortcode string from user-supplied GET parameters (token, email) and passing it to do_shortcode() without properly sanitizing square bracket characters, combined with missing authorization checks on the init hook. While sanitize_text_field() and esc_attr() are applied, neither function strips or escapes square bracket characters ([ and ]). WordPress's shortcode regex uses [^\\]\\/]* to match content inside shortcode tags, meaning a ] character in the token value prematurely closes the shortcode tag. This makes it possible for unauthenticated attackers to inject and execute arbitrary registered shortcodes by crafting a malicious token parameter containing ] followed by arbitrary shortcode syntax."}, {"lang": "es", "value": "El plugin Instant Popup Builder para WordPress es vulnerable a la Ejecuci\u00f3n Arbitraria de Shortcode No Autenticada en todas las versiones hasta la 1.1.7 inclusive. Esto se debe a que la funci\u00f3n handle_email_verification_page() construye una cadena de shortcode a partir de par\u00e1metros GET proporcionados por el usuario (token, email) y la pasa a do_shortcode() sin sanear correctamente los caracteres de corchete, combinado con la falta de comprobaciones de autorizaci\u00f3n en el hook init. Aunque se aplican sanitize_text_field() y esc_attr(), ninguna de las funciones elimina o escapa los caracteres de corchete ([ y ]). La expresi\u00f3n regular de shortcode de WordPress utiliza [^\\]\\/]* para hacer coincidir el contenido dentro de las etiquetas de shortcode, lo que significa que un car\u00e1cter ] en el valor del token cierra prematuramente la etiqueta de shortcode. Esto hace posible que atacantes no autenticados inyecten y ejecuten shortcodes registrados arbitrarios al crear un par\u00e1metro de token malicioso que contenga ] seguido de sintaxis de shortcode arbitraria."}], "lastModified": "2026-03-19T13:25:00.570", "sourceIdentifier": "security@wordfence.com"}