Deserialization Object Injection in Grand Wedding

Executive Summary

CVE-2026-22417 is a high-priority PHP Object Injection vulnerability found in the WordPress Grand Wedding Theme versions up to and including 3.1.0.

This vulnerability allows unauthenticated attackers to perform PHP Object Injection by exploiting deserialization of untrusted data, which can lead to severe security issues.

If a suitable Property Oriented Programming (POP) chain is available, attackers can leverage this vulnerability to execute remote code, perform SQL injection, path traversal, denial of service, and other critical impacts.

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Impact Analysis

This vulnerability can have severe impacts including remote code execution, which allows attackers to run arbitrary code on the affected system.

It can also lead to SQL injection, enabling attackers to manipulate or access the database unlawfully.

Other possible impacts include path traversal, which can expose sensitive files, and denial of service, which can disrupt the availability of the website.

Since the vulnerability requires no authentication to exploit, it poses a significant risk to website owners using the affected theme.

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Compliance Impact

I don't know

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Detection Guidance

There is no specific detection command or method provided in the available resources for identifying exploitation attempts of CVE-2026-22417 on your network or system.

However, since the vulnerability involves PHP Object Injection in the WordPress Grand Wedding Theme up to version 3.1.0, monitoring for unusual PHP object deserialization or suspicious HTTP requests targeting this theme could be helpful.

Patchstack has issued a mitigation rule to block exploitation attempts, which may include firewall or web application firewall (WAF) rules that can be applied to detect or block attacks.

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Mitigation Strategies

Immediate mitigation steps include applying the Patchstack mitigation rule designed to block exploitation attempts of this vulnerability until an official patch is released.

Users are strongly advised to implement these mitigations proactively to protect their sites from unauthenticated PHP Object Injection attacks.

Additionally, consider restricting access to the affected theme files, monitoring for suspicious activity, and preparing to update the theme once an official patch becomes available.

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