CVE-2026-66602 is a Cross-Site Request Forgery (CWE-352) vulnerability affecting DevItems HashBar – WordPress Notification Bar versions up to 2.0.0. The flaw allows attackers to perform unauthorized actions on behalf of authenticated users by exploiting the lack of proper CSRF protections. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. No patch or official remediation information is provided in the available data.

Successful exploitation of this CSRF vulnerability can lead to unauthorized actions performed with the privileges of an authenticated user, potentially resulting in full compromise of the affected system's confidentiality, integrity, and availability. This can include unauthorized configuration changes or other malicious activities within the WordPress environment where the HashBar plugin is installed.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider disabling the plugin or restricting access to trusted users only. Implementing additional CSRF protections at the application or web server level may help mitigate risk temporarily.