CVE-2025-15457 identifies a security flaw in the bg5sbk MiniCMS product, versions 1.0 through 1.8, affecting the Trash File Restore Handler component within the file /minicms/mc-admin/post.php. The vulnerability is characterized by improper authentication, allowing an attacker to bypass normal authentication mechanisms remotely without any privileges or user interaction. The root cause appears to be insufficient validation or access control in a function responsible for handling trash file restoration, which can be manipulated to gain unauthorized access. The vulnerability is exploitable over the network, making it a significant risk for exposed web servers running the affected CMS. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no authentication required (AT:N), and no user interaction (UI:N), with limited impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Despite the vendor being contacted early, no patch or mitigation guidance has been released, and public exploit code is available, increasing the likelihood of exploitation. This vulnerability could allow attackers to restore deleted content, modify CMS data, or potentially escalate privileges within the CMS environment, undermining the security posture of affected systems.

For European organizations, the improper authentication vulnerability in MiniCMS poses a risk of unauthorized access to content management functions, potentially leading to data tampering, unauthorized content restoration, or defacement. This can compromise the integrity and confidentiality of web content, damage organizational reputation, and disrupt business operations dependent on the CMS. Since the exploit requires no authentication or user interaction and can be executed remotely, attackers can target exposed web servers at scale. Organizations in sectors such as government, media, education, and small to medium enterprises that rely on MiniCMS for website management are particularly vulnerable. The lack of vendor response and patches increases exposure duration, raising the risk of exploitation by opportunistic attackers or automated scanning tools. Additionally, compromised CMS instances could serve as footholds for further network intrusion or malware deployment, amplifying the impact on European entities.

Given the absence of official patches, European organizations should immediately audit their web infrastructure to identify any deployments of bg5sbk MiniCMS versions 1.0 through 1.8. If found, organizations should consider the following mitigations: 1) Restrict access to the /minicms/mc-admin/post.php endpoint via network-level controls such as firewalls or web application firewalls (WAFs) to allow only trusted IP addresses or internal networks. 2) Implement strict authentication and authorization checks at the web server or reverse proxy level to prevent unauthenticated access to administrative paths. 3) Monitor web server logs for suspicious requests targeting the Trash File Restore Handler or unusual POST requests to the affected endpoint. 4) Employ virtual patching techniques using WAF rules to detect and block exploitation attempts based on known exploit patterns. 5) Consider migrating to alternative CMS platforms or updated versions once patches become available. 6) Conduct regular vulnerability scanning and penetration testing focused on CMS components to detect similar issues proactively. 7) Educate IT and security teams about this vulnerability to ensure rapid response to any detected exploitation attempts.