Unauthenticated PHP Object Injection in Qwery

Executive Summary

CVE-2026-78533 is an unauthenticated PHP Object Injection vulnerability in the Qwery WordPress theme versions 3.6.1 and below. This flaw allows attackers to inject malicious PHP objects into the application without authentication, potentially leading to remote code execution or other harmful actions on the server.

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Detection Guidance

Detecting PHP Object Injection in Qwery theme requires checking for vulnerable versions. Inspect WordPress installations for Qwery theme version 3.6.1 or below. Use commands like 'wp theme list' in WP-CLI or check the theme's style.css file for version details.

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Impact Analysis

This vulnerability can allow attackers to take full control of your website or server without needing to log in. They could steal sensitive data, deface your site, install malware, or use your server for further attacks. Since no authentication is required, even non-technical users with outdated themes are at risk.

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Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for protecting user data. Organizations may face legal penalties, fines, or reputational damage if exploited. Immediate mitigation is critical to maintain compliance.

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Mitigation Strategies

Immediately apply Patchstack's mitigation rule to block attacks. Update the Qwery theme to the latest version if available. If no patch exists, consider disabling the theme or seeking developer assistance. Contact your hosting provider for additional support.

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