CVE-2026-15826 Details.
User Profile Builder 3.16.4 - Unauthenticated Authentication Bypass
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-15826. What It Means.
The User Profile Builder plugin for WordPress version 3.16.4 is vulnerable to an authentication bypass via type confusion. Profile Builder's automatic-login-after-registration handler passes the return value of wp_insert_user() through absint() before testing it with is_wp_error(), so the error check runs against the already-coerced integer. A registration submitted with a 61-70 character username passes the plugin's own validation but is rejected by WordPress core, because…
Affected Product. What Is Hit.
- Vendor
- cozmoslabs
- Product
- Cozmoslabs Profile Builder
References. Where To Read More.
- https://www.wordfence.com/threat-intel/vulnerabilities/id/9f606fba-f779-42ea-a160-6c3b20dc5e79
- https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/front-end/class-formbuilder.php#L262
- https://plugins.trac.wordpress.org/browser/profile-builder/tags/3.16.4/features/functions.php#L1481
- https://plugins.trac.wordpress.org/changeset/3609855/profile-builder
- https://github.com/HORKimhab/CVE-2026-15826-CVE-2026-15748
- https://nvd.nist.gov/vuln/detail/CVE-2026-15826
FAQ
Common Questions.
User Profile Builder 3.16.4 - Unauthenticated Authentication Bypass. The User Profile Builder plugin for WordPress version 3.16.4 is vulnerable to an authentication bypass via type confusion. Profile Builder's automatic-login-after-registration handler passes the return value of wp_insert_user() through absint() before testing it with is_wp_error(), so the error check runs against the already-coerced integer. A registration submitted with a 61-70 character username passes the plugin's own validation but is rejected by WordPress core, because…
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-15826 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-15826 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Cozmoslabs Profile Builder to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-15826. Atlas does not run a check for it, so nothing here says whether a particular site is affected.