CVE-2025-13993

MEDIUM 5.5

MailerLite – Signup forms (official) <= 1.7.16 - Authenticated (Administrator+) Stored Cross-Site Scripting

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	mailerlite
Product	mailerlite – signup forms (official)
Published	Dec 12, 2025
Last Updated	Apr 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

mailerlite / MailerLite – Signup forms (official)

0 ≤ 1.7.16

References

NVD ↗ CVE.org ↗ EPSS Data ↗

Credits

NosleeP