The Campaign Monitor Forms by Optin Cat WordPress plugin before 2.5.6 does not prevent users with low privileges (like subscribers) from overwriting any options on a site with the string true, which could lead to a variety of outcomes, including DoS.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Campaign_monitor_optin_cat | Fatcatapps | * | 2.5.6 (excluding) |