The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_description' and 'success_message' parameters in versions up to, and including, 1.7.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Official Mailerlite Sign Up Forms Plugin | — | Update official-mailerlite-sign-up-forms plugin to version 1.7.17, or a newer patched version | Dec 12, 2025 | Dec 11, 2025 |
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