The Zweb Social Mobile – Ứng Dụng Nút Gọi Mobile plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘vithanhlam_zsocial_save_messager’, 'vithanhlam_zsocial_save_zalo', 'vithanhlam_zsocial_save_hotline', and 'vithanhlam_zsocial_save_contact' parameters in all versions up to, and including, 1.0.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.