CVE-2025-67592 identifies a Missing Authorization vulnerability in the Joe Dolson My Calendar WordPress plugin, affecting versions up to and including 3.6.16. This vulnerability arises from incorrectly configured access control security levels within the plugin, which fails to properly enforce authorization checks on certain functionalities. As a result, an attacker with access to the WordPress environment could perform unauthorized actions that should be restricted, such as modifying calendar entries, accessing sensitive event data, or altering plugin settings. The absence of a CVSS score indicates that the vulnerability has not yet been fully assessed, but the core issue is a classic access control failure, which is a critical security concern. No public exploits have been reported, suggesting that exploitation is not yet widespread, but the risk remains significant due to the nature of the flaw. The vulnerability affects the confidentiality and integrity of data managed by the plugin, potentially allowing unauthorized data disclosure or manipulation. Since the plugin is commonly used for event management on WordPress sites, organizations relying on it for scheduling and public-facing calendars could face operational and reputational risks if exploited. The vulnerability does not require user interaction but does require the attacker to have some level of access to the WordPress installation, such as a subscriber or contributor role, depending on the plugin’s deployment. The lack of patch links indicates that a fix may not yet be publicly available, emphasizing the need for vigilance and interim mitigations.

For European organizations, the impact of this vulnerability could be significant, particularly for those using WordPress sites with the My Calendar plugin for event management, internal scheduling, or public communications. Unauthorized access could lead to data leakage of sensitive event information, unauthorized modification or deletion of calendar entries, and potential disruption of organizational operations dependent on accurate scheduling. This could affect sectors such as education, government, cultural institutions, and businesses that rely heavily on event coordination. The integrity and availability of calendar data could be compromised, leading to operational inefficiencies and loss of trust from users or clients. Additionally, if exploited, attackers might leverage the access to pivot to other parts of the WordPress environment, potentially escalating privileges or deploying further attacks. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits rapidly once vulnerabilities are disclosed.

Organizations should monitor for official patches or updates from the Joe Dolson My Calendar plugin developer and apply them immediately upon release. Until a patch is available, administrators should review and tighten WordPress user roles and permissions to limit access to the plugin’s functionalities only to trusted users. Implementing Web Application Firewalls (WAFs) with rules targeting unauthorized access attempts to the plugin’s endpoints can provide an additional layer of defense. Regularly auditing plugin configurations and access logs can help detect suspicious activities early. If feasible, temporarily disabling the My Calendar plugin or replacing it with alternative calendar management solutions with verified security postures can reduce exposure. Organizations should also ensure their WordPress core and other plugins are up to date to minimize the attack surface. Finally, educating site administrators about the risks of improper access control and encouraging the principle of least privilege will help mitigate similar vulnerabilities.