The WP Live Chat Support Pro plugin through 8.0.26 for WordPress contains an arbitrary file upload vulnerability. This results from an incomplete patch for CVE-2018-12426. Arbitrary file upload is achieved by using a non-blacklisted executable file extension in conjunction with a whitelisted file extension, and prepending "magic bytes" to the payload to pass MIME checks. Specifically, an unauthenticated remote user submits a crafted file upload POST request to the REST api remote_upload endpoint. The file contains data that will fool the plugin's MIME check into classifying it as an image (which is a whitelisted file extension) and finally a trailing .phtml file extension.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Wp Live Chat Support Pro Plugin | — | Update wp-live-chat-support-pro plugin to version 8.0.27, or a newer patched version | May 15, 2025 | May 7, 2019 |
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