CVE-2025-13993: MailerLite – Signup forms (official) <= 1.7.16 - Authenticated (Administrator+) Stored Cross-Site Scripting
The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'formdescription' and 'successmessage' 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-13993?
CVE-2025-13993 is classified as a high severity vulnerability due to its potential for Stored Cross-Site Scripting.
How do I fix CVE-2025-13993?
To fix CVE-2025-13993, upgrade the MailerLite Signup forms plugin to version 1.7.17 or later.
What parameters are affected by CVE-2025-13993?
CVE-2025-13993 affects the 'form_description' and 'success_message' parameters.
What can happen if CVE-2025-13993 is exploited?
Exploitation of CVE-2025-13993 can allow an attacker to execute arbitrary JavaScript in the context of the affected site.
Which versions of the MailerLite Signup forms plugin are vulnerable to CVE-2025-13993?
All versions of the MailerLite Signup forms plugin up to and including 1.7.16 are vulnerable to CVE-2025-13993.