CVE-2026-3516

<!-- PoC for CVE-2026-3516 Target parameter: _cl_map_iframe Description: Inject a malicious iframe with an onload event handler. --> <iframe src="about:blank" onload="alert('CVE-2026-3516 Stored XSS')"></iframe>

{"cve": {"id": "CVE-2026-3516", "sourceIdentifier": "[email protected]", "published": "2026-03-21T00:16:28.387", "lastModified": "2026-04-22T21:32:08.360", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Contact List plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '_cl_map_iframe' parameter in all versions up to, and including, 3.0.18. This is due to insufficient input sanitization and output escaping when handling the Google Maps iframe custom field. The saveCustomFields() function in class-contact-list-custom-fields.php uses a regex to extract <iframe> tags from user input but does not validate or sanitize the iframe's attributes, allowing event handlers like 'onload' to be included. The extracted iframe HTML is stored via update_post_meta() and later rendered on the front-end in class-cl-public-card.php without any escaping or wp_kses filtering. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page."}, {"lang": "es", "value": "El plugin Contact List para WordPress es vulnerable a cross-site scripting almacenado a través del parámetro '_cl_map_iframe' en todas las versiones hasta la 3.0.18, inclusive. Esto se debe a una sanitización de entrada y un escape de salida insuficientes al manejar el campo personalizado de iframe de Google Maps. La función saveCustomFields() en class-contact-list-custom-fields.php utiliza una expresión regular para extraer etiquetas de la entrada del usuario, pero no valida ni sanitiza los atributos del iframe, permitiendo que se incluyan manejadores de eventos como onload. El HTML del iframe extraído se almacena a través de update_post_meta() y luego se renderiza en el front-end en class-cl-public-card.php sin ningún escape o filtrado wp_kses. Esto hace posible que atacantes autenticados, con acceso de nivel Colaborador o superior, inyecten scripts web arbitrarios en páginas que se ejecutarán cada vez que un usuario acceda a una página inyectada."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/contact-list/tags/3.0.17/includes/class-contact-list-custom-fields.php#L675", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/contact-list/tags/3.0.17/includes/class-contact-list-custom-fields.php#L697", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/contact-list/tags/3.0.17/public/class-cl-public-card.php#L466", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/contact-list/trunk/includes/class-contact-list-custom-fields.php#L675", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/contact-list/trunk/includes/class-contact-list-custom-fields.php#L697", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/contact-list/trunk/public/class-cl-public-card.php#L466", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3486445", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/a8059995-55cb-49ee-add1-f5364d0772eb?source=cve", "source": "[email protected]"}]}}