CVE-2025-31403: 
WordPress vulnerability analysis and mitigation

The CVE-2025-31403 is a SQL Injection vulnerability affecting the WordPress Booking Calendar and Notification plugin versions up to 4.0.3. The vulnerability was discovered by Pham Van Tam and publicly disclosed on April 3, 2025. This critical security flaw allows unauthenticated attackers to perform Blind SQL Injection attacks against affected WordPress installations (Patchstack, NVD).

The vulnerability is classified as an Improper Neutralization of Special Elements used in an SQL Command (SQL Injection) with a CVSS v3.1 base score of 9.3 (Critical). The attack vector is network-accessible (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) or user interaction (UI:N). The scope is changed (S:C) with high confidentiality impact (C:H), no integrity impact (I:N), and low availability impact (A:L) (Patchstack).

This vulnerability allows malicious actors to directly interact with the website's database, potentially leading to unauthorized access to sensitive information. Given its critical CVSS score of 9.3, the vulnerability is considered highly dangerous and is expected to become mass exploited (Patchstack).

Currently, there is no official fix available for this vulnerability. However, Patchstack has issued a virtual patch to mitigate the issue by blocking potential attacks until an official fix becomes available. Website administrators are advised to implement the virtual patch immediately or consider removing the plugin until a security update is released (Patchstack).