{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-15826", "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "state": "PUBLISHED", "assignerShortName": "Wordfence", "dateReserved": "2026-07-15T13:58:17.387Z", "datePublished": "2026-08-15T06:38:09.559Z", "dateUpdated": "2026-08-15T06:38:09.559Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "shortName": "Wordfence", "dateUpdated": "2026-08-15T06:38:09.559Z"}, "affected": [{"vendor": "cozmoslabs", "product": "User Profile Builder \u2013 Beautiful User Registration Forms, User Profiles & User Role Editor", "versions": [{"version": "0", "status": "affected", "lessThanOrEqual": "3.16.4", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "The User Profile Builder plugin for WordPress is vulnerable to Authentication Bypass via Type Confusion in versions up to, and including, 3.16.4. This is due to the wppb_log_in_user() function calling absint() on the return value of wp_insert_user() before performing an is_wp_error() check \u2014 when a registration is submitted with a 61\u201370 character username, WordPress core rejects it with a WP_Error object, but absint() coerces that object to the integer 1 before the error check can short-circuit execution, causing the plugin to bind and return a transient-backed autologin nonce tied to user ID 1. This makes it possible for unauthenticated attackers to log in as the site's Administrator account (user ID 1), resulting in full administrative takeover of the site."}], "title": "User Profile Builder <= 3.16.4 - Unauthenticated Authentication Bypass via Type Confusion to Administrator Account Takeover via 'username' Parameter", "references": [{"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/9f606fba-f779-42ea-a160-6c3b20dc5e79?source=cve"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/default-fields/username/username.php#L28"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/default-fields/username/username.php#L49"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L742"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L364"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L262"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/features/functions.php#L1481"}, {"url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L945"}, {"url": "https://plugins.trac.wordpress.org/changeset/3609855/profile-builder"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-704 Incorrect Type Conversion or Cast", "cweId": "CWE-704", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}}], "credits": [{"lang": "en", "type": "finder", "value": "Supakiad S. (m3ez)"}], "timeline": [{"time": "2026-07-15T14:14:08.000Z", "lang": "en", "value": "Vendor Notified"}, {"time": "2026-08-14T18:24:03.000Z", "lang": "en", "value": "Disclosed"}]}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "User Profile Builder \u2013 Beautiful User Registration Forms, User Profiles & User Role Editor", "vendor": "cozmoslabs", "versions": [{"lessThanOrEqual": "3.16.4", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The User Profile Builder plugin for WordPress is vulnerable to Authentication Bypass via Type Confusion in versions up to, and including, 3.16.4. This is due to the wppb_log_in_user() function calling absint() on the return value of wp_insert_user() before performing an is_wp_error() check \u2014 when a registration is submitted with a 61\u201370 character username, WordPress core rejects it with a WP_Error object, but absint() coerces that object to the integer 1 before the error check can short-circuit execution, causing the plugin to bind and return a transient-backed autologin nonce tied to user ID 1. This makes it possible for unauthenticated attackers to log in as the site's Administrator account (user ID 1), resulting in full administrative takeover of the site."}], "id": "CVE-2026-15826", "lastModified": "2026-08-15T07:16:19.280", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}]}, "published": "2026-08-15T07:16:19.280", "references": [{"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/features/functions.php#L1481"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L262"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L364"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L742"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L945"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/default-fields/username/username.php#L28"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/default-fields/username/username.php#L49"}, {"source": "[email protected]", "url": "https://plugins.trac.wordpress.org/changeset/3609855/profile-builder"}, {"source": "[email protected]", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/9f606fba-f779-42ea-a160-6c3b20dc5e79?source=cve"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-704"}], "source": "[email protected]", "type": "Primary"}]}

{}

{"created": "2026-08-15T16:00:07.797783+00:00", "updated": "2026-08-15T16:00:07.797788+00:00", "vendors": []}