The aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.17.0 via the /ablocks/v1/form-builder/registration REST endpoint. The vulnerability exists because the endpoint is registered with permissioncallback => returntrue and the register() handler reads roleSlug directly from attacker-controlled block attributes in postcontent without ever verifying that the block's formType is registration — a condition that RegistrationFormSanitizer::verify() imposes only at save-time, meaning a Contributor can preserve an arbitrary roleSlug by saving a block with formType='login' and then triggering the endpoint via a valid wprest nonce and post-ownership check. This makes it possible for authenticated attackers, with Contributor-level access and above, to escalate their WordPress role to Editor or any other non-administrator role and receive a fully authenticated session at the elevated privilege level via WPUser::setrole() and wpsetauthcookie(). Escalation is bounded below administrator-tier roles because issaferegistrationrole() rejects any role holding manageoptions, editusers, deleteusers, createusers, promoteusers, or editthemeoptions, meaning the highest practically reachable role on a standard WordPress installation is Editor.

The WP Map Block WordPress plugin before 2.0.3 does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

The aBlocks – WordPress Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the "Table Of Content" Block, specifically in the "markerView" attribute, in all versions up to, and including, 1.6.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.