Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tag
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tag
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tag
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tag
- https://plugins.trac.wordpress.org/changeset/3416100/official-mailerlite-sign-up
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8c37cc28-fde0-45c6-b49
FAQ
What is CVE-2025-13993?
CVE-2025-13993 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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,...
How severe is CVE-2025-13993?
CVE-2025-13993 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-13993?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.