CVE-2025-59131 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the WP-CalDav2ICS plugin for WordPress, developed by Hoernerfranz. The affected versions include all releases up to 1.3.4. The vulnerability arises because the plugin fails to adequately verify the origin of state-changing requests, allowing attackers to craft malicious web requests that, when executed by an authenticated user, perform unauthorized actions. This CSRF flaw leads to stored Cross-Site Scripting (XSS), where malicious scripts injected via forged requests are persistently stored and executed in the context of the victim's browser. The CVSS 3.1 score of 7.1 reflects the network attack vector, low attack complexity, no privileges required, but user interaction is necessary. The scope is changed, indicating that the vulnerability affects components beyond the initially vulnerable plugin, potentially impacting the broader WordPress environment. The confidentiality, integrity, and availability of the affected systems can be compromised, as attackers may steal sensitive data, manipulate calendar entries, or disrupt service availability. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be considered a significant risk for sites using this plugin. The lack of authentication requirements for exploitation increases the threat surface, especially for sites with multiple users or public-facing calendar functionalities.

For European organizations, this vulnerability poses a significant risk to WordPress sites utilizing the WP-CalDav2ICS plugin, particularly those managing sensitive calendar data or integrating with enterprise scheduling systems. Successful exploitation could lead to unauthorized modification or deletion of calendar entries, leakage of confidential scheduling information, and execution of malicious scripts that may compromise user sessions or deliver further malware. This can disrupt business operations, lead to data breaches, and damage organizational reputation. The stored XSS aspect increases the risk of persistent attacks affecting multiple users. Given the widespread use of WordPress across Europe, especially in SMBs and public sector entities, the impact could be broad. Organizations relying on calendar integrations for critical workflows or customer interactions may experience operational disruptions. Additionally, the vulnerability could be leveraged as a foothold for more extensive attacks within corporate networks, especially if combined with other vulnerabilities or social engineering tactics.

Immediate mitigation steps include disabling the WP-CalDav2ICS plugin until a security patch is released by the vendor. Organizations should implement Web Application Firewall (WAF) rules to detect and block CSRF attack patterns targeting the plugin endpoints. Enforce strict SameSite cookie attributes and Content Security Policy (CSP) headers to reduce the risk of CSRF and XSS exploitation. Review and tighten user permissions within WordPress to limit the impact of compromised accounts. Conduct thorough audits of calendar data for unauthorized changes or injected scripts. Educate users about the risks of interacting with suspicious links or websites while authenticated to vulnerable WordPress sites. Monitor logs for unusual request patterns indicative of CSRF attempts. Once a patch is available, prioritize its deployment in all affected environments. Consider isolating WordPress instances managing sensitive calendar data to reduce lateral movement risks. Regularly update all WordPress plugins and core components to minimize exposure to similar vulnerabilities.