CVE-2025-13993 — MailerLite – Signup forms (official) [official-mailerlite-sign-up-forms] < 1.7.17

CVE	Vulnerability	Type	Severity	Affected	Fixed in	Published	Status
CVE-2025-13993	MailerLite – Signup forms (official) [official-mailerlite-sign-up-forms] < 1.7.17	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	Medium 5.5	< 1.7.17	1.7.17	2025-12-11	—

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 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.

Source: CVE.org

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