Reported vulnerability

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

Q: Which versions of User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission are affected?

Wordfence lists these affected versions: Start version unspecified, through 4.3.1. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission?

Wordfence reports a fix for this issue in User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission. It lists these fixed versions: 4.3.2. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 7 May 2026

Updated 8 May 2026

CVE-2026-5127

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

high · CVSS 8.8

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.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission

Software: plugin · wp-user-frontend
Affected versions: Start version unspecified, through 4.3.1
Fix availability: Fix available
Fixed versions: 4.3.2

Recommended action

Update to version 4.3.2, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/2b5d27cc-c6eb-4c5c-8ee1-30483b91c6fd?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission are affected?

Wordfence lists these affected versions: Start version unspecified, through 4.3.1. Use the version checker above to compare your installed release with this report.

Is a fix available for User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission?

Wordfence reports a fix for this issue in User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission. It lists these fixed versions: 4.3.2. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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