Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-1542 is a vulnerability in the Super Stage WP WordPress plugin versions up to and including 1.0.1. It occurs because the plugin unserializes user input received via the 'data' parameter in an HTTP REQUEST at a publicly accessible endpoint without requiring authentication."}, {'type': 'paragraph', 'content': "Specifically, the plugin base64-decodes and unserializes a serialized PHP object sent by the user. This insecure deserialization can lead to PHP Object Injection if a suitable gadget chain exists within the blog's codebase."}, {'type': 'paragraph', 'content': "This means an attacker can send specially crafted data to the plugin's endpoint to manipulate the application logic or potentially execute arbitrary PHP code."}] [1]

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Impact Analysis

This vulnerability allows unauthenticated attackers to perform PHP Object Injection, which can lead to serious security risks.

• Execution of arbitrary PHP code on the affected WordPress site.
• Manipulation of application logic, potentially leading to unauthorized actions.
• Compromise of the affected WordPress installation, including data breaches or site defacement.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by sending a specially crafted HTTP request to the vulnerable endpoint and observing the response. The endpoint is publicly accessible at /wp-content/plugins/super-stage-wp/Staging/bridge/bridge.php and accepts a base64-encoded serialized PHP object via the data parameter.'}, {'type': 'paragraph', 'content': 'A common detection method is to send a test payload such as a base64-encoded serialized array, for example: YToxOntzOjQ6InRlc3QiO3M6NToiaGVsbG8iO30= which corresponds to a:1:{s:4:"test";s:5:"hello";}.'}, {'type': 'paragraph', 'content': 'You can use the following curl command to test the vulnerability:'}, {'type': 'list_item', 'content': 'curl -X POST -d "data=YToxOntzOjQ6InRlc3QiO3M6NToiaGVsbG8iO30=" https://target-site.com/wp-content/plugins/super-stage-wp/Staging/bridge/bridge.php'}, {'type': 'paragraph', 'content': 'If the response contains a serialized error message indicating processing of the input but no matching action, it confirms that the endpoint unserializes the input and is vulnerable.'}] [1]

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Mitigation Strategies

There is no known fix available at the time of disclosure for this vulnerability.

Immediate mitigation steps include:

• Disable or remove the Super Stage WP plugin version 1.0.1 or earlier from your WordPress installation.
• Restrict access to the vulnerable endpoint (/wp-content/plugins/super-stage-wp/Staging/bridge/bridge.php) via web server configuration or firewall rules to trusted IPs only.
• Monitor your logs for suspicious requests containing base64-encoded serialized data in the data parameter.
• Keep your WordPress installation and plugins updated and watch for any patches or updates released by the plugin author addressing this issue.

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