CVE-2026-95866
Received Received - Intake

Stored XSS in User Profile Builder WordPress Plugin

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: Wordfence

Description
The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Avatar Field in all versions up to, and including, 4.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The zero-length multipart file branch in wppb_save_avatar_value() writes the raw request value directly to user meta, bypassing the wppb_save_attachment_id()/wppb_verify_attachment_id() validation path; the stored payload is later adopted as a WordPress attachment URL and rendered unescaped by wppb_default_fields_make_upload_button() when an administrator views the affected account.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-95866
EUVD
EUVD-2026-86598

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
wp_user_profile_builder wp_user_profile_builder to 4.0.2 (inc)
wp-user-avatar wp-user-avatar to 4.0.2 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the User Profile Builder WordPress plugin. It allows unauthenticated attackers to inject malicious scripts via the Avatar field due to insufficient input sanitization and output escaping. The vulnerability exists in versions up to 4.0.2.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the User Profile Builder plugin up to version 4.0.2. Check for unauthorized script injections in avatar fields by reviewing user meta data and attachment URLs. Look for unusual web scripts in pages rendered by wppb_default_fields_make_upload_button().

Impact Analysis

An attacker could inject malicious scripts that execute when a user accesses an infected page. This could lead to unauthorized actions, data theft, or defacement of the website. Administrators viewing affected accounts may have the payload rendered unescaped.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR and HIPAA compliance. Stored XSS may allow attackers to steal sensitive information, resulting in data breaches and non-compliance with privacy regulations.

Mitigation Strategies

Update the User Profile Builder plugin to the latest version beyond 4.0.2 immediately to patch the vulnerability. If an update is not available, consider disabling the plugin temporarily until a fix is released.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-95866. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart