CVE-2025-6220 is a high-severity vulnerability affecting the WordPress plugin 'Ultra Addons for Contact Form 7' developed by themefic. The vulnerability stems from improper input validation in the 'save_options' function, which fails to restrict the types of files that authenticated users with Administrator-level privileges can upload. This flaw is classified under CWE-434, indicating an unrestricted file upload vulnerability. Because the plugin does not validate or restrict file types, attackers with sufficient privileges can upload arbitrary files, including potentially malicious scripts. This capability can lead to remote code execution (RCE) on the affected web server, allowing attackers to execute commands, manipulate data, or pivot within the network. The vulnerability affects all versions up to and including 3.5.12, and no patch has been published at the time of this report. The CVSS v3.1 base score is 7.2, reflecting a high severity with network attack vector, low attack complexity, high privileges required, no user interaction, and impacts on confidentiality, integrity, and availability. Although exploitation requires administrator access, which limits the initial attack surface, the consequences of exploitation are severe. No known exploits are currently in the wild, but the vulnerability poses a significant risk to WordPress sites using this plugin, especially those with multiple administrators or where administrator credentials may be compromised through other means. The vulnerability's presence in a widely used WordPress plugin increases the potential attack surface, as WordPress powers a significant portion of websites globally, including many European organizations. Given the plugin's integration with Contact Form 7, a popular form management tool, many sites may be affected if they use this addon without updating or mitigating the risk.

For European organizations, this vulnerability presents a critical risk primarily to websites and web applications running WordPress with the Ultra Addons for Contact Form 7 plugin installed. Successful exploitation can lead to remote code execution, enabling attackers to gain persistent access, deface websites, steal sensitive data, or use compromised servers as a foothold for further attacks within the corporate network. This can result in data breaches, service disruptions, reputational damage, and regulatory non-compliance issues under GDPR. Organizations relying on WordPress for customer-facing portals, e-commerce, or internal tools are particularly vulnerable. The requirement for administrator-level access means that the threat is heightened in environments where administrator credentials are shared, weak, or have been previously compromised. Additionally, attackers may leverage social engineering or phishing to escalate privileges and exploit this vulnerability. The lack of a patch increases the urgency for organizations to implement compensating controls. The impact extends beyond individual websites to the broader IT infrastructure if attackers use the compromised server as a launchpad for lateral movement or to deploy ransomware. Given the widespread use of WordPress in Europe, especially in small and medium enterprises and public sector websites, the potential for widespread impact is significant.

1. Immediate mitigation should focus on restricting administrator access to trusted personnel only and enforcing strong, unique credentials combined with multi-factor authentication (MFA) to reduce the risk of credential compromise. 2. Disable or remove the Ultra Addons for Contact Form 7 plugin if it is not essential, or replace it with alternative plugins that do not have this vulnerability. 3. Monitor web server logs and WordPress activity logs for unusual file upload attempts or unexpected changes in the plugin's directory. 4. Implement web application firewalls (WAF) with custom rules to detect and block suspicious file upload patterns targeting this plugin's endpoints. 5. Limit file system permissions for the WordPress installation to prevent execution of uploaded files in directories where uploads occur. 6. Regularly audit installed plugins and themes for vulnerabilities and maintain a patch management process to apply updates promptly once a patch is released. 7. Conduct internal security awareness training to prevent phishing and credential theft that could lead to administrator account compromise. 8. Consider deploying intrusion detection/prevention systems (IDS/IPS) to detect exploitation attempts. 9. Backup website data and configurations regularly to enable rapid recovery in case of compromise. 10. Engage with the plugin vendor or community to track the release of patches and security advisories.