EUVD-2026-59593
GHSA-2v77-3rr8-9p3p
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated remote registration submission (AV:N/AC:L/PR:N/UI:N) yields full admin takeover, so confidentiality, integrity, and availability are all High with unchanged scope.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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 - when a registration is submitted with a 61-70 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.
Articles & Coverage 1
AnalysisAI
Authentication bypass in the User Profile Builder WordPress plugin (versions through 3.16.4) lets unauthenticated attackers log in as the site's Administrator (user ID 1) by submitting a registration with a 61-70 character username, resulting in full site takeover. The flaw is a PHP type-confusion bug where an error object is silently coerced to the integer 1, binding an autologin nonce to the admin account. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the site expose a Profile Builder front-end registration form reachable by anonymous users (the plugin's core registration feature). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-priority issue rather than an inflated high-CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker locates a WordPress site running Profile Builder with a public registration form, then submits a registration request containing a username between 61 and 70 characters. WordPress core rejects the username with a WP_Error, but the plugin's flawed type handling issues an autologin nonce for the Administrator (user ID 1), and the attacker follows the returned nonce to authenticate as admin. … |
| Remediation | Upgrade to the first release published after 3.16.4 that contains changeset 3609855, which reorders the logic to perform the is_wp_error() check before absint() coercion; the exact patched version tag is not independently confirmed from the provided data, so verify the current version on the WordPress.org plugin page and update immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: immediately deactivate the User Profile Builder plugin on all affected WordPress instances and review access logs for suspicious admin logins or registrations with 61-70 character usernames. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
The isMail transport in PHPMailer before 5.2.20 might allow remote attackers to pass extra parameters to the mail comman
The Backup Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1
The Hash Form - Drag & Drop Form Builder plugin for WordPress is vulnerable to arbitrary file uploads due to missing fil
The GiveWP - Donation Plugin and Fundraising Platform plugin for WordPress is vulnerable to PHP Object Injection in all
The Simple File List plugin for WordPress through version 4.2.2 contains an unauthenticated remote code execution vulner
The AI Engine WordPress plugin through version 3.1.3 exposes Bearer Token values through the /mcp/v1/ REST API endpoint
The Ninja Forms plugin before 2.9.42.1 for WordPress allows remote attackers to conduct PHP object injection attacks via
The Business Directory Plugin - Easy Listing Directories for WordPress plugin for WordPress is vulnerable to time-based
Remote code execution in WordPress 6.9.x (before 6.9.5) and 7.0.x (before 7.0.2) arises from a REST API batch endpoint r
SQL injection in the NotificationX WordPress plugin (versions up to and including 2.8.2) allows unauthenticated remote a
The POST SMTP Mailer - Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress i
The MasterStudy LMS WordPress Plugin - for Online Courses and Education plugin for WordPress is vulnerable to union base
Same weakness CWE-704 – Incorrect Type Conversion or Cast
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today