The Popupkit plugin for WordPress is vulnerable to arbitrary subscriber data deletion due to missing authorization on the DELETE `/subscribers` REST API endpoint in all versions up to, and including, 2.2.0. This is due to the `permission_callback` only validating wp_rest nonce without checking user capabilities. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary subscriber records.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Popup Builder Block Plugin | — | Update popup-builder-block plugin to version 2.2.1, or a newer patched version | Jan 6, 2026 | Jan 5, 2026 |
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