Executive brief
The User Profile Builder plugin for WordPress, which manages user registrations and profiles, contains a security flaw that allows logged-in users to change the ownership of website content. By exploiting this vulnerability, a standard user (such as a subscriber) could reassign posts or file attachments to themselves or others. This could lead to unauthorized modification of site content and disruption of administrative workflows.
Technical details
The vulnerability is classified as an Insecure Direct Object Reference (IDOR) within the wppb_save_avatar_value() function. The root cause is a lack of validation on a user-controlled key, specifically allowing the modification of the 'post_author' field. An authenticated attacker with at least subscriber-level permissions can exploit this over the network to reassign ownership of arbitrary posts and attachments. This bypasses intended authorization controls for content management. The issue is fixed in versions following 3.15.5.
Affected products
- Cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor <= 3.15.5
Timeline
- 2026-03-31: disclosed
- 2026-03-31: advisory