CVE-2025-64259 identifies a missing authorization vulnerability in the Theater for WordPress plugin developed by Jeroen Schmit, affecting all versions up to and including 0.18.8. This vulnerability arises from incorrectly configured access control security levels within the plugin, which allows remote attackers to bypass authorization checks. The flaw does not require any authentication or user interaction, and can be exploited over the network (AV:N), with low attack complexity (AC:L). The impact primarily affects confidentiality and integrity, allowing unauthorized access to potentially sensitive data or unauthorized modification of plugin-related content, but does not affect availability. The vulnerability has been assigned a CVSS v3.1 base score of 6.5, reflecting a medium severity level. No known exploits are currently active in the wild, and no patches have been linked yet. The issue was reserved on October 29, 2025, and published on November 13, 2025. The plugin is used to manage theater-related content on WordPress sites, which may include event schedules, ticketing information, or multimedia content. The missing authorization could allow attackers to access or alter such data without proper permissions, potentially leading to data leakage or content tampering. Since the plugin operates within WordPress, the vulnerability's impact depends on the plugin's deployment scale and the sensitivity of the hosted content.

For European organizations, especially those running cultural, entertainment, or event management websites using the Theater for WordPress plugin, this vulnerability poses a risk of unauthorized data exposure and content manipulation. Confidentiality impacts include potential leakage of event details, user information, or internal scheduling data. Integrity impacts involve unauthorized modification of event content or plugin configurations, which could disrupt operations or damage reputation. Although availability is not directly affected, the indirect consequences of data tampering could lead to operational disruptions. The risk is heightened for organizations that rely heavily on WordPress for public-facing event management and ticketing, as attackers could exploit this flaw to mislead customers or gain footholds for further attacks. The absence of required authentication lowers the barrier for exploitation, increasing the threat surface. However, the lack of known active exploits and the medium CVSS score suggest a moderate but actionable risk. European organizations must assess their exposure based on plugin usage and the criticality of the affected data.

1. Monitor the official plugin repository and vendor communications for a security patch and apply it immediately upon release. 2. Until a patch is available, restrict access to the WordPress admin dashboard and plugin management interfaces using IP whitelisting, VPNs, or multi-factor authentication to reduce unauthorized access risk. 3. Implement web application firewall (WAF) rules to detect and block suspicious requests targeting the Theater for WordPress plugin endpoints. 4. Conduct regular audits of plugin permissions and user roles to ensure only trusted administrators have modification rights. 5. Review and harden WordPress security configurations, including disabling unnecessary plugins and enforcing least privilege principles. 6. Maintain comprehensive logging and monitoring to detect anomalous activities related to the plugin. 7. Consider temporarily disabling the Theater for WordPress plugin if it is not critical to operations until a fix is available. 8. Educate site administrators about the vulnerability and encourage vigilance against phishing or social engineering attempts that could facilitate exploitation.