CVE-2026-19116
Received Received - Intake

PHP Object Injection in User Frontend WordPress Plugin

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: WPScan

Description
The User Frontend WordPress plugin before 4.3.11 does not prevent user-supplied field values from being deserialized when a submitted post is reopened in its frontend editing form, allowing authenticated users with subscriber-level access and above to perform PHP Object Injection, which may lead to remote code execution when a suitable gadget chain is present on the site.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-19116
EUVD
EUVD-2026-69865

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
wp_user_frontend wp_user_frontend to 4.3.11 (exc)
the_user_frontend the_user_frontend to 4.3.11 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

The User Frontend WordPress plugin before version 4.3.11 has a flaw where user-supplied field values are improperly deserialized during frontend post editing. This allows authenticated users with Subscriber-level access or higher to perform PHP Object Injection, which could lead to remote code execution if a suitable gadget chain is present on the site.

Detection Guidance

Check the installed version of the WP User Frontend plugin. If it is below 4.3.11, the system is vulnerable. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files directly.

Impact Analysis

An attacker with Subscriber-level access could exploit this to execute arbitrary PHP code on your WordPress site, potentially taking full control of the site, stealing data, or installing malware. This requires a vulnerable plugin version and a suitable gadget chain.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR (data protection) and HIPAA (health data security) requirements. A successful exploit may result in data breaches, requiring breach notifications and potential fines.

Mitigation Strategies

Update the WP User Frontend plugin to version 4.3.11 or later immediately. Remove or restrict access for users with Subscriber-level permissions until the update is applied.

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