Unauthorized Data Modification in MailerLite Signup Forms for WordPress
CVE-2026-3253

4.3MEDIUM

Key Information:

Vendor

WordPress
Status
Mailerlite – Signup Forms (official)
Vendor
CVE Published:
24 September 2026

What is CVE-2026-3253?

The MailerLite Signup Forms plugin for WordPress is susceptible to unauthorized data modification owing to the absence of a capability check in the forms() method of the AdminController class in all versions up to and including 1.7.21. This vulnerability permits authenticated attackers with Contributor-level access or higher to create or delete any signup forms, thereby compromising data integrity and potentially affecting user interactions.

Affected Version(s)

MailerLite – Signup forms (official) 0 <= 1.7.21

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3505999/

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tarcísio Luchesi De Almeida Silva (Poystick)
.