XSS in Mailerlite – Signup Forms (Official)
CVE-2025-13993
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 sanit…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (24.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Mailerlite – Signup Forms (Official) — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-13993?
- CVE-2025-13993 is a medium-severity vulnerability in Mailerlite – Signup Forms (Official), classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2025-12-12.
- How severe is CVE-2025-13993?
- Medium severity. CVSS v3 base score is 5.5 out of 10.