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cve recordcritical

CVE-2026-15826

Published
CVSS9.8
Severitycritical
WeaknessCWE-704
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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 accoun

References

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CVE-2026-19478high

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CVE-2026-15826critical

WordPress Plugin Flaw Exposes 40,000 Sites to Admin Takeover

A critical vulnerability in the WordPress User Profile Builder plugin, affecting over 40,000 sites, allows unauthenticated attackers to gain administrator access. The flaw, CVE-2026-15826, stems from a type confusion error that can trick the plugin into granting administrative privileges if specific configurations are met, such as the administrator using user ID 1 and automatic login after registration being enabled. The plugin developer has released a patch, version 3.16.5, to address the issue.