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    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.

    Published:Dec 12, 2025
    Last Modified:Apr 21, 2026
    EPS:Dec 12, 2025
    EPSS Score:0.00061
    CVSS Score:5.5

    Affected Products

    Vendor
    Mailerlite
    Product
    Mailerlite
    Vendor
    Mailerlite
    Product
    Mailerlite Signup Forms
    Vendor
    Wordpress
    Product
    Wordpress

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High