BaseFortify

Executive Summary

CVE-2026-57371 is a PHP Object Injection vulnerability found in the WordPress WPJAM Basic Plugin versions 7.0 and below. It occurs due to improper handling of user input, allowing attackers to inject malicious objects into the application.

This vulnerability can lead to serious security issues such as remote code execution, SQL injection, path traversal, denial of service, or other attacks if a suitable Property-Oriented Programming (POP) chain exists.

Exploitation requires at least contributor-level privileges and the vulnerability is classified under the OWASP Top 10 category A3: Injection.

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Impact Analysis

If exploited, this vulnerability can have severe impacts including unauthorized code execution on the server, data breaches through SQL injection, unauthorized file access via path traversal, and denial of service attacks.

Such impacts can compromise the integrity, confidentiality, and availability of your website and its data.

Because the vulnerability can be exploited in mass campaigns targeting thousands of websites, it poses a significant risk to affected installations.

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Detection Guidance

The vulnerability arises from improper handling of user input in the WPJAM Basic plugin versions 7.0 and below, allowing PHP Object Injection. Detection involves monitoring for unusual or malicious object injection attempts targeting this plugin.

While specific commands are not provided, typical detection methods include inspecting web server logs for suspicious POST or GET requests containing serialized PHP objects or unusual payloads targeting the WPJAM Basic plugin endpoints.

Additionally, applying the mitigation rule provided by Patchstack can help temporarily block attack attempts until the plugin is updated.

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Mitigation Strategies

• Immediately update the WPJAM Basic plugin to version 7.0.1 or later, which contains the patch for this vulnerability.
• If updating is not possible immediately, apply the mitigation rule provided by Patchstack to temporarily block attacks targeting this vulnerability.
• Seek assistance from your hosting provider or a web developer to implement temporary protections or workarounds.

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