CVE-2024-4665 is an authorization bypass vulnerability classified under CWE-639 affecting the EventPrime WordPress plugin versions before 3.5.0. The flaw arises because the plugin does not properly validate user permissions when updating bookings, allowing authenticated users with limited privileges to modify or cancel bookings that belong to other users. Additionally, the affected feature lacks a nonce, which is a security token used to prevent CSRF (Cross-Site Request Forgery) attacks, further weakening the security posture. The vulnerability requires the attacker to be authenticated (PR:L) but does not require user interaction (UI:N), and it can be exploited remotely over the network (AV:N). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially compromised component. The impact affects confidentiality and integrity to a limited extent (C:L, I:L) but does not impact availability (A:N). The absence of nonce protection increases the risk of CSRF attacks, potentially allowing attackers to perform unauthorized booking changes on behalf of other users. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk to organizations relying on EventPrime for event booking management, as unauthorized booking modifications can lead to data leakage, privacy violations, and operational disruptions in event scheduling. The vulnerability was published on May 15, 2025, and has a CVSS v3.1 score of 6.4, indicating a medium severity level. The vendor has not yet provided patch links, so organizations should monitor for updates and apply them promptly once available.

For European organizations, this vulnerability can lead to unauthorized access and modification of booking data within the EventPrime plugin, potentially exposing personal information of attendees and disrupting event management workflows. This can result in privacy breaches under GDPR regulations, reputational damage, and operational inefficiencies. Organizations that rely heavily on EventPrime for managing events, conferences, or appointments may face risks of unauthorized cancellations or modifications, impacting customer trust and service reliability. Since the vulnerability requires authentication, insider threats or compromised user accounts pose a significant risk. The lack of nonce protection also increases the risk of CSRF attacks, which could be exploited through social engineering or phishing campaigns targeting authenticated users. The impact is particularly critical for sectors with strict data protection requirements such as healthcare, education, and government agencies in Europe. Additionally, event organizers and businesses in the hospitality and tourism industries could experience financial losses and customer dissatisfaction due to booking tampering.

European organizations should immediately audit their WordPress installations to identify if EventPrime plugin versions prior to 3.5.0 are in use. Until a patch is released, restrict plugin access to trusted users only and enforce strong authentication mechanisms such as multi-factor authentication (MFA) to reduce the risk of compromised accounts. Implement web application firewall (WAF) rules to detect and block suspicious requests targeting booking update endpoints. Review and tighten user roles and permissions within WordPress to ensure minimal privilege principles are enforced. Monitor logs for unusual booking modification activities and conduct regular security assessments of the plugin. Once available, promptly update the EventPrime plugin to version 3.5.0 or later, which should include proper permission validation and nonce implementation. Additionally, consider deploying CSRF protection mechanisms at the application or server level if plugin updates are delayed. Educate users about phishing risks to prevent credential compromise that could facilitate exploitation.