Kleor Contact Manager PHP Object Injection Vulnerability

A deserialization vulnerability allowing object injection has been identified in the Kleor Contact Manager plugin for WordPress, affecting versions through 9.1.1. This vulnerability arises from the improper handling of untrusted data, which could potentially be exploited to execute arbitrary code, inject malicious SQL, traverse file paths, cause denial-of-service conditions, and more, if a suitable object injection chain is available.

Impact

Exploitation of this vulnerability could lead to PHP object injection, allowing for a range of attacks including code execution, SQL injection, path traversal, and denial-of-service, depending on the presence of a proper object injection chain.

Remediation

Users are advised to update to a version of the Kleor Contact Manager plugin for WordPress that is later than 9.1.1. For those using Patchstack, a mitigation rule is available to block attacks until an official patch can be safely applied.