This vulnerability (CVE-2026-96833) affects Ultimate Addons for Contact Form 7 versions up to and including 3.5.51. It is caused by unsafe deserialization of untrusted data, leading to PHP Object Injection. The CVSS 3.1 base score is 7.2, indicating high severity, with network attack vector, low attack complexity, high privileges required, no user interaction, and impacts on confidentiality, integrity, and availability. No known exploits in the wild or vendor patches are currently documented.

Successful exploitation of this vulnerability could allow an attacker with high privileges to execute arbitrary PHP object injection, potentially leading to full system compromise including data disclosure, modification, or denial of service. The vulnerability affects confidentiality, integrity, and availability of the affected system.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the affected plugin and limit privileges to reduce risk. Monitor vendor channels for updates and apply patches promptly once released.