Unauthenticated Cross Site Scripting (XSS) in Happyforms <= 1.26.15 versions.

The Happyforms – Form Builder for WordPress: Drag & Drop Contact Forms, Surveys, Payments & Multipurpose Forms plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 1.26.12 via the happyformsgetformpartial() function. This makes it possible for authenticated attackers, with Administrator-level access and above, to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included.

The Happyforms WordPress plugin before 1.26.3 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 unfilteredhtml capability is disallowed (for example in multisite setup).

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Happyforms allows Stored XSS.This issue affects Happyforms: from n/a through 1.26.0.

Missing Authorization vulnerability in Happyforms.This issue affects Happyforms: from n/a through 1.25.10.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Happyforms Form builder to get in touch with visitors, grow your email list and collect payments — Happyforms allows Reflected XSS.This issue affects Form builder to get in touch with visitors, grow your email list and collect payments — Happyforms: from n/a through 1.25.9.

The Happyforms WordPress plugin before 1.22.0 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.