Executive Summary

CVE-2025-31100 is an Arbitrary File Upload vulnerability in the WordPress School Management Plugin up to version 1.93.1. It allows an attacker with student-level privileges to upload any type of file, including malicious web shells, to the web server. This can lead to execution of unauthorized code and further compromise of the website. [1]

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Impact Analysis

This vulnerability can allow attackers to gain unauthorized access and control over your website by uploading and executing malicious files. This can lead to data breaches, website defacement, loss of availability, and potentially full server compromise. [1]

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Detection Guidance

Detection involves monitoring for suspicious activity related to file uploads by users with student privileges, especially uploads of unexpected file types such as web shells. Since plugin-based malware scanners are discouraged due to potential tampering, it is recommended to monitor web server logs for unusual POST requests to upload endpoints and check for newly created files with executable extensions in the plugin directories. Specific commands depend on the server environment, but examples include using 'grep' to search web server logs for upload attempts and 'find' to locate recently added suspicious files. For example, on a Linux server: 1) grep POST requests in access logs: grep 'POST' /var/log/apache2/access.log | grep 'upload' 2) find recently created files with suspicious extensions: find /path/to/wordpress/wp-content/plugins/school-management/ -type f -mtime -7 \( -name '*.php' -o -name '*.phtml' -o -name '*.php5' \) [1]

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Mitigation Strategies

Immediate mitigation steps include applying the virtual patch (vPatch) provided by Patchstack to block attack attempts until an official fix is released. Additionally, monitor for suspicious activity related to file uploads, restrict upload permissions to trusted users only if possible, and consult hosting providers or professional incident response services if a compromise is suspected. Avoid relying on plugin-based malware scanners as they can be tampered with by attackers. [1]

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