MailerLite lets Contributors create and delete signup forms
A Contributor or higher can invoke AdminController::forms() without the required capability check, creating or deleting arbitrary signup forms. The request route and form-selector parameters are unspecified. Affected versions: <= 1.7.21.
- Component
- MailerLite – Signup forms (official)
- Plugin slug
official-mailerlite-sign-up-forms- Affected
- <= 1.7.21
- Safe version
- See mitigation notes
- Published
- Sep 24, 2026
- Weakness
- CWE-862 — Missing Authorization
This CVE was published Sep 24, 2026 and is one of 6 known issues for this plugin.
Update, patch or deactivate.
This archive could not verify a fixed version from the official author release notes reviewed on 2026-10-13. Disable the affected feature or component where practical until remediation for the deployed configuration is established. Authorize each form-management request with the intended administrative capability and verify request intent; review missing or unexpected signup forms. Official author release notes: https://wordpress.org/plugins/official-mailerlite-sign-up-forms/#developers.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the forms() method of the AdminController class in all versions up to, and including, 1.7.21. This makes it possible for authenticated attackers, with Contributor-level access and above, to create or delete arbitrary signup forms.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N