CVE-2025-59131 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the WP-CalDav2ICS plugin for WordPress, developed by Hoernerfranz. The flaw exists in versions up to 1.3.4 and allows attackers to trick authenticated users into submitting unwanted requests to the vulnerable web application. This can lead to stored Cross-Site Scripting (XSS) attacks, where malicious scripts are injected and persist on the site, potentially compromising user sessions and data. The vulnerability is exploitable remotely without requiring authentication (AV:N/PR:N), but it requires user interaction (UI:R), such as clicking a crafted link or visiting a malicious webpage. The scope is changed (S:C), meaning the attack can affect resources beyond the vulnerable component. The impact affects confidentiality, integrity, and availability, albeit at a low level individually (C:L/I:L/A:L). No patches or public exploits are currently available, but the vulnerability is published and recognized by Patchstack. The plugin is used to synchronize calendar data via CalDAV to ICS format, often in WordPress environments, making it a target for attackers aiming to compromise scheduling or calendar-related data. The CWE-352 classification confirms the root cause as insufficient CSRF protections, allowing unauthorized state-changing requests. The stored XSS aspect increases risk by enabling persistent malicious code execution within the context of the affected site.

European organizations using the WP-CalDav2ICS plugin are at risk of unauthorized actions being performed on their WordPress sites without their consent, potentially leading to data leakage, session hijacking, or defacement via stored XSS. This can disrupt business operations, especially for organizations relying on calendar integrations for scheduling and communications. The confidentiality of user data and integrity of calendar information can be compromised, leading to reputational damage and compliance issues under GDPR if personal data is exposed. Availability impacts may arise if attackers leverage the vulnerability to inject disruptive scripts or perform denial-of-service-like actions. Since WordPress is widely used across Europe, organizations in sectors such as government, education, and enterprises using this plugin could face targeted attacks. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits post-disclosure.

1. Monitor for official patches or updates from Hoernerfranz and apply them immediately once available. 2. In the absence of patches, implement Web Application Firewall (WAF) rules to detect and block CSRF attack patterns targeting the plugin endpoints. 3. Enforce strict Content Security Policy (CSP) headers to mitigate the impact of stored XSS by restricting script execution sources. 4. Limit plugin usage to trusted administrators and users with minimal privileges to reduce attack surface. 5. Educate users about phishing and social engineering risks to prevent inadvertent interaction with malicious links. 6. Conduct regular security audits and penetration testing focusing on WordPress plugins and their integrations. 7. Consider disabling or replacing the WP-CalDav2ICS plugin with alternatives that have robust security controls if immediate patching is not feasible. 8. Implement multi-factor authentication (MFA) for WordPress admin accounts to reduce the risk of account compromise.