WP Custom Admin Interface <= 7.28 - Authenticated (Administrator+) PHP Object Injection

The WP Custom Admin Interface plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 7.28, via deserialization of untrusted input in the northernbeacheswebsites_information and wp_custom_admin_interface_import_settings functions. This allows administrator-level attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code. The vulnerability is patched by setting allowed_classes. While this makes the vulnerability more or less unexploitable, PHP recommends not passing untrusted input to the unserialize function.

An attacker needs Administrator access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: WP Custom Admin Interface 7.29 closes this, and updating the plugin is the step that ends it.

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