The MB Custom Post Types & Custom Taxonomies WordPress plugin before 2.7.7 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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https://wpscan.com/vulnerability/b5fd7a3e-33e4-4c73-a581-881f063855b0/ | technical description exploit vdb entry third party advisory |