CVE-2021-39353: 
WordPress vulnerability analysis and mitigation

The Easy Registration Forms WordPress plugin was found to contain a Cross-Site Request Forgery (CSRF) vulnerability, identified as CVE-2021-39353. The vulnerability was present in versions up to and including 2.1.1, stemming from missing nonce validation in the ajaxaddform function located in the ~/includes/class-form.php file. This security flaw was discovered by the Thinkland Security Team (Wordfence).

The vulnerability received a CVSS v3.1 Base Score of 8.8 (High) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The technical root cause was identified as CWE-352 (Cross-Site Request Forgery). The vulnerability specifically exists in the ajaxaddform function, where the absence of proper nonce validation could allow attackers to inject arbitrary web scripts (NVD).

The vulnerability allows attackers to potentially execute arbitrary web scripts through CSRF attacks. With a high CVSS score of 8.8, the impact affects confidentiality, integrity, and availability, all rated as high severity, indicating significant potential damage to affected systems (Wordfence).

Users should upgrade their Easy Registration Forms WordPress plugin to a version newer than 2.1.1, which contains the security fix for this vulnerability (NVD).