Executive Summary

CVE-2026-24989 is a high-priority PHP Object Injection vulnerability found in the WordPress SUMO Affiliates Pro Plugin versions prior to 11.4.0.

This vulnerability allows unauthenticated attackers to perform PHP Object Injection, which means they can inject malicious objects into the application.

If a suitable Property Oriented Programming (POP) chain is available, this can lead to severe consequences such as remote code execution, SQL injection, path traversal, denial of service, and other attacks.

The vulnerability requires no privileges to exploit, making it particularly dangerous and easy for attackers to leverage.

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Impact Analysis

This vulnerability can have critical impacts including remote code execution, which allows attackers to run arbitrary code on your server.

It can also lead to SQL injection, enabling attackers to manipulate your database and potentially access or alter sensitive data.

Other possible impacts include path traversal, which can expose or modify files outside the intended directories, and denial of service attacks that can disrupt your website's availability.

Because the vulnerability requires no authentication, it can be exploited by anyone, increasing the risk of widespread attacks.

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Detection Guidance

The CVE-2026-24989 vulnerability affects versions of the SUMO Affiliates Pro WordPress plugin prior to 11.4.0 and allows unauthenticated PHP Object Injection. Detection typically involves identifying if the vulnerable plugin version is installed on your WordPress site.

Since the vulnerability is exploited via HTTP requests targeting the plugin, monitoring web server logs for suspicious requests related to the SUMO Affiliates Pro plugin may help detect exploitation attempts.

Specific commands are not provided in the resources, but common approaches include:

• Checking the installed plugin version via WordPress CLI: `wp plugin list` to verify if SUMO Affiliates Pro is installed and its version.
• Searching web server logs for suspicious requests targeting the plugin's endpoints or unusual POST requests that could indicate exploitation attempts.
• Using vulnerability scanners or Patchstack's platform which provides automated detection and mitigation rules for this vulnerability.

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Mitigation Strategies

The primary and immediate mitigation step is to update the SUMO Affiliates Pro WordPress plugin to version 11.4.0 or later, where the vulnerability is patched.

Until the update can be applied, enabling Patchstack's automatic mitigation rule can block exploitation attempts.

Users of Patchstack can also enable auto-updates specifically for vulnerable plugins to ensure continuous protection.

Additionally, monitoring for suspicious activity and applying general WordPress security best practices can help reduce risk.

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Compliance Impact

The CVE-2026-24989 vulnerability allows unauthenticated attackers to perform PHP Object Injection, potentially leading to remote code execution, SQL injection, path traversal, denial of service, and other attacks. Such security breaches can result in unauthorized access to sensitive data or disruption of services.

While the provided information does not explicitly mention compliance with standards like GDPR or HIPAA, vulnerabilities that enable unauthorized data access or system compromise can negatively impact compliance with these regulations, which require protection of personal and sensitive data.

Therefore, failure to promptly patch this vulnerability could lead to violations of data protection requirements under common standards and regulations.

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