CVE-2025-15457 identifies an improper authentication vulnerability in the bg5sbk MiniCMS product, affecting all versions up to 1.8. The vulnerability is located in an unspecified function within the Trash File Restore Handler component, specifically in the /minicms/mc-admin/post.php file. This flaw allows an unauthenticated remote attacker to bypass authentication controls, gaining unauthorized access to administrative functionalities without requiring any privileges or user interaction. The vulnerability is exploitable over the network with low attack complexity, as indicated by the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N). The impact includes partial loss of confidentiality, integrity, and availability, as unauthorized users could manipulate or restore deleted content, potentially altering website data or configurations. Despite public disclosure and availability of exploit code, there is no evidence of active exploitation in the wild. The vendor has not issued any patches or responses, leaving affected systems exposed. The lack of authentication enforcement in a critical administrative component represents a significant security risk, especially for organizations relying on MiniCMS for content management. Without vendor support, organizations must rely on alternative mitigation strategies to protect their environments.

For European organizations, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of web content managed via bg5sbk MiniCMS. Unauthorized access to administrative functions could lead to data tampering, unauthorized content restoration, or even full compromise of the CMS environment. This could result in defacement, data leakage, or disruption of services, impacting business operations and reputation. Given the ease of remote exploitation without authentication or user interaction, attackers could automate attacks at scale. Organizations in sectors such as government, media, and e-commerce that depend on MiniCMS for website management are particularly vulnerable. The absence of vendor patches increases the risk exposure duration, necessitating immediate defensive actions. Additionally, compliance with European data protection regulations (e.g., GDPR) could be jeopardized if sensitive data is accessed or altered through this vulnerability.

Since no official patches are available, European organizations should implement compensating controls immediately. These include restricting access to the /minicms/mc-admin/ directory via network-level controls such as IP whitelisting or VPN-only access to limit exposure to trusted users. Web application firewalls (WAFs) should be configured to detect and block suspicious requests targeting the Trash File Restore Handler or unusual POST requests to /minicms/mc-admin/post.php. Regular monitoring and logging of access to administrative endpoints should be enhanced to detect potential exploitation attempts. If feasible, organizations should consider disabling or removing the Trash File Restore Handler component until a patch or vendor guidance is available. Additionally, migrating to alternative CMS platforms with active vendor support should be evaluated for long-term risk reduction. Incident response plans should be updated to include this vulnerability, and staff should be trained to recognize signs of exploitation. Finally, organizations should maintain awareness of any future vendor updates or community patches addressing this issue.