CVE-2025-62880 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the Custom 404 Pro plugin developed by Kunal Nagar, affecting versions up to 3.12.0. CSRF vulnerabilities occur when an attacker tricks an authenticated user into unknowingly submitting a request to a web application, causing the application to perform unintended actions on behalf of the user. In this case, the plugin lacks proper CSRF protections such as anti-CSRF tokens or referer validation, allowing attackers to craft malicious web pages or emails that, when visited by a user with an active session, can trigger unauthorized operations within the plugin. The CVSS vector indicates the attack can be performed remotely (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), but requires user interaction (UI:R). The impact is limited to integrity (I:L), with no confidentiality (C:N) or availability (A:N) impact. This suggests that while the attacker cannot steal data or disrupt service, they can potentially alter plugin settings or behavior in a limited manner. The vulnerability is publicly disclosed and assigned a medium severity rating with a CVSS score of 4.3. No patches or known exploits are currently available, indicating the need for proactive mitigation by users of the plugin. The vulnerability is relevant primarily to websites using the Custom 404 Pro plugin, which is typically deployed on WordPress platforms to customize 404 error pages. Given the nature of CSRF, the threat is significant in environments where users have elevated privileges or where the plugin controls critical site behavior.

For European organizations, the impact of CVE-2025-62880 depends on the extent of Custom 404 Pro plugin usage within their WordPress environments. The vulnerability could allow attackers to manipulate plugin settings or behaviors without authorization, potentially leading to defacement, redirection to malicious sites, or other integrity compromises. While confidentiality and availability are not directly affected, the integrity impact can undermine trust and user experience, particularly for e-commerce, media, and governmental websites that rely on customized error handling for user navigation and branding. Exploitation requires user interaction but no authentication, increasing the risk in environments with high user traffic and diverse user roles. The absence of known exploits reduces immediate risk but does not eliminate the potential for future attacks. Organizations failing to address this vulnerability may face reputational damage, compliance challenges, and increased exposure to follow-on attacks leveraging the compromised plugin state.

To mitigate CVE-2025-62880, European organizations should first verify if they use the Custom 404 Pro plugin and identify affected versions up to 3.12.0. Since no official patch is currently available, administrators should implement compensating controls such as disabling or restricting access to the plugin's administrative interfaces to trusted IPs or user roles. Employing Web Application Firewalls (WAFs) with custom rules to detect and block CSRF attack patterns can reduce exposure. Encouraging users to log out after sessions and implementing multi-factor authentication (MFA) can limit the window for exploitation. Monitoring web server logs for unusual POST requests or referer headers inconsistent with legitimate traffic can help detect attempted CSRF attacks. Once a patch is released, prompt application of updates is critical. Additionally, developers maintaining the plugin should incorporate anti-CSRF tokens and validate request origins to prevent unauthorized actions. Regular security audits and penetration testing focusing on CSRF vectors will further strengthen defenses.