CVE-2023-49856: 
WordPress vulnerability analysis and mitigation

A Missing Authorization vulnerability was discovered in RedNao Smart Forms WordPress plugin (CVE-2023-49856), affecting versions up to 2.6.84. The vulnerability was discovered by Abdi Pranata and publicly disclosed on December 7, 2023. The issue resides in the plugin's AJAX action implementation, specifically in the smart_forms_save_settings() function (Patchstack, WPScan).

The vulnerability stems from improper authorization controls in the AJAX action hooked to smart_forms_save_settings(). The plugin fails to verify that the options being updated belong to the plugin itself, resulting in a broken access control issue. The vulnerability has been assigned a CVSS v3.1 score of 8.1 (High) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H, indicating a serious security risk (Patchstack).

The vulnerability allows any authenticated user, including those with subscriber-level privileges, to update arbitrary WordPress options. This includes critical system settings such as default_role and users_can_register, potentially leading to significant security implications for affected WordPress installations (WPScan).

The vulnerability requires authentication but can be exploited by users with minimal privileges such as subscriber-level access. The low complexity of exploitation and the potential for significant impact makes this vulnerability particularly concerning (Patchstack).

The vulnerability has been fixed in version 2.6.85 of the Smart Forms plugin. Site administrators are strongly advised to update to this version or later to resolve the security issue. For users unable to update immediately, Patchstack has issued a virtual patch to mitigate this issue by blocking potential attacks (Patchstack).