Executive Summary

The vulnerability is an Arbitrary File Upload flaw in the WordPress Webenvo Theme versions 0.0.6 and below.

It allows attackers with only Subscriber-level privileges to upload malicious files, including backdoors, to compromised websites.

This flaw is classified under OWASP Top 10 A3: Injection and has a critical CVSS score of 9.9.

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Impact Analysis

Exploitation of this vulnerability can lead to attackers uploading malicious files such as backdoors to your website.

This can result in full compromise of the affected website, including potential data theft, unauthorized access, and disruption of services.

Given the high CVSS score of 9.9, the risk is critical and could lead to widespread exploitation affecting thousands of websites.

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Mitigation Strategies

Immediate mitigation is advised by updating the WordPress Webenvo Theme to version 0.0.7 or later.

Alternatively, apply Patchstack’s mitigation rule to block attacks until an update is possible.

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Compliance Impact

The vulnerability allows attackers to upload arbitrary malicious files, including backdoors, to compromised websites. This can lead to unauthorized access, data breaches, and potential manipulation or theft of sensitive information.

Such unauthorized access and data breaches can result in non-compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data, timely breach notification, and implementation of adequate security controls.

Therefore, exploitation of this vulnerability could lead to violations of these regulations, exposing affected organizations to legal penalties, reputational damage, and financial loss.

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Detection Guidance

This vulnerability affects WordPress Webenvo Theme versions 0.0.6 and below, allowing arbitrary file uploads by users with Subscriber-level privileges.

To detect if your system is vulnerable, first verify the installed version of the Webenvo theme. If it is version 0.0.6 or below, your system is at risk.

You can check the theme version by running the following command in the WordPress installation directory:

• grep 'Version:' wp-content/themes/webenvo/style.css

Additionally, monitor your web server logs for suspicious file upload attempts or unexpected files in the theme directories, which may indicate exploitation attempts.

Since the vulnerability allows arbitrary file uploads, scanning for recently added or modified files in the theme directory can help detect potential compromises:

• find wp-content/themes/webenvo/ -type f -mtime -7

It is also recommended to apply Patchstack’s mitigation rules or update the theme to version 0.0.7 or later to prevent exploitation.

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