User Profile Builder <= 4.0.3 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Display Name in Avatar Image
- ID
- WPSEC-2026-0889
- Plugin
- User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor (profile-builder)
- Affected
- all versions before 4.0.4
- Remediation
- Update to 4.0.4 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-14
- Attack surface
- User Profile Builder on WPSec AttackSurface
- Fix released
- Published
Description
The User Profile Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the avatar image alt text in all versions up to, and including, 4.0.3. This is due to the wppb_changeDefaultAvatar() function building the custom avatar <img> tag from the unescaped alt value, which can hold the user's display name, inside a single-quoted attribute. This makes it possible for authenticated attackers with Subscriber-level access and above, who have uploaded a custom avatar, to inject arbitrary web scripts through their display name. The scripts run whenever a user opens a page that renders their avatar with the display name as alt text.
References
- https://wpsec.com/vuln/WPSEC-2026-0889/
- https://plugins.svn.wordpress.org/profile-builder/tags/4.0.4/
- https://wordpress.org/plugins/profile-builder/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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