Executive Summary

CVE-2026-40733 is a high-priority PHP Object Injection vulnerability found in the WordPress ShiftUp Theme versions 1.3 and below.

This vulnerability allows unauthenticated attackers to inject malicious PHP objects, which can lead to code execution, SQL injection, path traversal, or denial of service if a suitable POP (Property Oriented Programming) chain exists.

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Impact Analysis

This vulnerability poses a significant risk because it can be exploited without authentication, potentially allowing attackers to execute arbitrary code, perform SQL injection, traverse paths, or cause denial of service on affected websites.

Such exploitation could compromise the integrity, confidentiality, and availability of your website and its data.

Additionally, the vulnerability could be targeted in mass campaigns affecting thousands of websites, increasing the likelihood of widespread impact.

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to update the WordPress ShiftUp Theme to version 1.4 or later, as this version contains the patch for the PHP Object Injection flaw.

Until the update can be applied, Patchstack has issued a mitigation rule to block attacks targeting this vulnerability.

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Compliance Impact

The vulnerability in ShiftUp versions 1.3 and below allows unauthenticated PHP Object Injection, which can lead to code execution, SQL injection, path traversal, or denial of service. Such security flaws can result in unauthorized access to sensitive data or disruption of services.

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

Organizations using affected versions should update to version 1.4 or later immediately to mitigate risks and maintain compliance.

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