CVE-2025-62739 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the SaifuMak Add Custom Codes plugin, versions up to and including 4.80. CSRF vulnerabilities occur when an attacker tricks an authenticated user into submitting a forged HTTP request, causing the victim's browser to perform unwanted actions on a web application where they are logged in. In this case, the vulnerability allows remote attackers to execute unauthorized commands or changes via crafted requests without requiring any privileges or prior authentication, only relying on user interaction (e.g., clicking a malicious link). The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, and high impact on confidentiality, integrity, and availability. This means an attacker can remotely exploit the vulnerability with minimal effort if a user interacts with a malicious link or site, potentially leading to complete compromise of the affected system's data and functionality. The plugin is typically used to add custom code snippets to websites, often in content management systems, making it a critical component for site customization. Exploitation could result in unauthorized code injection, data theft, defacement, or denial of service. No patches or known exploits are currently documented, but the vulnerability's nature and impact necessitate urgent attention. The vulnerability was reserved in October 2025 and published in December 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses a significant risk to web applications utilizing the SaifuMak Add Custom Codes plugin. Exploitation could lead to unauthorized changes in website content, injection of malicious scripts, data breaches, or service disruptions, severely impacting business operations and reputation. Confidential customer data and internal information could be exposed or manipulated, violating GDPR and other data protection regulations, potentially resulting in legal and financial penalties. Organizations in sectors such as finance, healthcare, government, and e-commerce are particularly vulnerable due to their reliance on web applications and the sensitivity of their data. The ease of exploitation without authentication and the high impact on system integrity and availability increase the threat level. Additionally, the requirement for user interaction means phishing or social engineering campaigns could be leveraged to trigger attacks. The absence of known exploits currently provides a window for proactive defense but also suggests attackers may develop exploits soon. Failure to address this vulnerability promptly could lead to targeted attacks against European entities, especially those with high web presence or critical infrastructure.

1. Immediately verify if the SaifuMak Add Custom Codes plugin is in use and identify affected versions (<=4.80). 2. Apply any available patches or updates from the vendor as soon as they are released. 3. Implement anti-CSRF tokens in all forms and state-changing requests within the web application to ensure requests originate from legitimate users. 4. Enforce strict validation of HTTP headers such as the Origin and Referer headers to detect and block unauthorized cross-origin requests. 5. Limit user permissions to the minimum necessary, especially for roles that can modify or add custom code, reducing the potential impact of compromised accounts. 6. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts injected via CSRF attacks. 7. Educate users about phishing and social engineering tactics to reduce the likelihood of user interaction with malicious links. 8. Monitor web server logs and application behavior for unusual activities indicative of CSRF exploitation attempts. 9. Consider implementing web application firewalls (WAF) with rules specifically designed to detect and block CSRF attack patterns. 10. Conduct regular security assessments and penetration testing focusing on CSRF and related vulnerabilities.