Executive Summary

CVE-2026-39529 is a critical PHP Object Injection vulnerability found in the WordPress Elementra Theme versions 1.0.9 and below.

This flaw allows unauthenticated attackers to inject malicious PHP objects, potentially enabling code execution, SQL injection, path traversal, denial of service, and other harmful actions if a suitable Property-Oriented Programming (POP) chain exists.

It is classified under the OWASP Top 10 category A3: Injection and is actively exploitable, posing a high risk to affected websites.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, which may lead to full site 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 conditions disrupting website availability.

Because the vulnerability is unauthenticated and actively exploitable, it can be used in mass-exploit campaigns targeting thousands of websites, increasing the risk of widespread damage.

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Detection Guidance

The vulnerability is an unauthenticated PHP Object Injection in the WordPress Elementra Theme versions 1.0.9 and below. Detection typically involves monitoring for exploit attempts targeting this theme, especially looking for unusual HTTP requests that may attempt code injection, SQL injection, or path traversal.

While no specific commands are provided in the available resources, users can monitor web server logs for suspicious requests containing serialized PHP objects or unusual payloads targeting the Elementra theme.

Additionally, applying Patchstack's automated rules can help detect and block attack attempts related to this vulnerability.

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Mitigation Strategies

Immediate mitigation steps include updating the WordPress Elementra Theme to version 1.1.0 or later, which contains the patch for this vulnerability.

Until the update can be applied, users are advised to implement mitigation measures such as Patchstack's automated rules to block attack attempts targeting this vulnerability.

Monitoring and restricting access to vulnerable endpoints and ensuring proper web application firewall (WAF) rules are in place can also help reduce risk.

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Compliance Impact

The vulnerability in the WordPress Elementra Theme (versions 1.0.9 and below) is a critical PHP Object Injection flaw that can lead to code execution, SQL injection, path traversal, and denial of service attacks. Such security weaknesses can result in unauthorized access to sensitive data or disruption of services.

Because of the potential for data breaches and service interruptions, this vulnerability could negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information and maintaining system integrity and availability.

Organizations using affected versions of the theme should update immediately or apply mitigation measures to reduce the risk of exploitation and help maintain compliance with these regulations.

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