Contributor PHP Object Injection in ARMember <= 7.0

Executive Summary

The WordPress ARMember Premium Plugin, specifically versions 7.0 and below, contains a PHP Object Injection vulnerability (CVE-2026-27060). This vulnerability allows attackers to inject malicious PHP objects into the application.

If a suitable POP (Property Oriented Programming) chain exists, attackers can exploit this flaw to perform various malicious activities such as code injection, SQL injection, path traversal, and denial of service.

The vulnerability has a CVSS severity score of 8.8, indicating a high risk.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, which may lead to full system compromise.

• Execution of arbitrary code on the affected server.
• SQL injection attacks that could expose or manipulate sensitive data.
• Path traversal attacks potentially allowing access to restricted files.
• Denial of service attacks that could disrupt website availability.

Because of its high severity and potential for mass exploitation, websites using vulnerable versions of the plugin are at significant risk.

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Mitigation Strategies

Immediate mitigation steps include updating the ARMember Premium plugin to a version above 7.0 if available.

Since no official patch is currently available, applying the mitigation rule issued by Patchstack to block attacks is advised.

You should also consider seeking assistance from your hosting provider or a developer to help implement these mitigations.

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