{"id":12597,"date":"2025-03-31T14:33:26","date_gmt":"2025-03-31T14:33:26","guid":{"rendered":"https:\/\/fusionmindlabs.com\/blogs\/wp-mu-plugins-exploited-for-spam\/"},"modified":"2025-03-31T14:33:27","modified_gmt":"2025-03-31T14:33:27","slug":"wp-mu-plugins-exploited-for-spam","status":"publish","type":"post","link":"https:\/\/fusionmindlabs.com\/blogs\/wp-mu-plugins-exploited-for-spam\/","title":{"rendered":"WP mu-Plugins Exploited for Spam"},"content":{"rendered":"\n<\/p>\n
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\ue802<\/i>Mar 31, 2025<\/span>\ue804<\/i>Ravie Lakshmanan<\/span><\/span>Data Theft \/ Website Security<\/span><\/p>\n<\/div>\n

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Malicious actors are exploiting a vulnerability in WordPress sites by utilizing the “mu-plugins” directory to conceal malicious code, allowing them to maintain persistent remote access and redirect site visitors to fake websites.<\/p>\n

The term “mu-plugins” refers to must-use plugins, which are located in a special directory (“wp-content\/mu-plugins”) and are automatically executed by WordPress without needing to be enabled through the admin dashboard. This makes the directory an attractive location for malicious actors to stage malware.<\/p>\n

According to Sucuri researcher Puja Srivastava, “this approach represents a concerning trend, as mu-plugins are not listed in the standard WordPress plugin interface, making them less noticeable and easier for users to overlook during routine security checks,” as stated in an analysis<\/a>.<\/p>\n

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In incidents analyzed by the website security company, three types of malicious PHP code have been discovered in the directory:<\/p>\n