CVE-2025-54757 is a vulnerability affecting multiple versions of Alfasado Inc.'s PowerCMS, specifically all versions 6.7 and earlier in the 6.x series. The vulnerability arises from the system allowing unrestricted upload of files with dangerous types by product users. This means that users can upload files that may contain malicious scripts or code without proper validation or restriction. The critical aspect of this vulnerability is that if a product administrator subsequently accesses or opens such a malicious file within their browser, it may lead to the execution of arbitrary scripts. This behavior indicates a cross-site scripting (XSS)-like impact vector, where the administrator’s browser environment is compromised, potentially allowing attackers to execute malicious code in the context of the administrator’s session. The CVSS 3.1 base score is 6.5, classified as medium severity, with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L) and user interaction (UI:R), with a scope change (S:C) and low impact on confidentiality, integrity, and availability (C:L/I:L/A:L). The vulnerability requires that the attacker has at least some level of authenticated access to upload files and that the administrator interacts with the malicious file, which limits the ease of exploitation but still presents a significant risk. No known exploits are currently reported in the wild, and no patches or mitigation links have been published yet. The vulnerability could be leveraged to compromise administrative accounts or gain further foothold in the CMS environment, potentially leading to data leakage, defacement, or further exploitation within the affected organization’s infrastructure.

For European organizations using PowerCMS 6.7 or earlier, this vulnerability poses a tangible risk to the confidentiality, integrity, and availability of their content management systems. Since PowerCMS is often used to manage web content, exploitation could lead to unauthorized script execution in administrator browsers, potentially resulting in session hijacking, credential theft, or unauthorized administrative actions. This could disrupt business operations, lead to data breaches involving sensitive or personal data protected under GDPR, and damage organizational reputation. The requirement for authenticated user upload and administrator interaction reduces the risk somewhat but does not eliminate it, especially in environments where multiple users have upload privileges or where administrators frequently access user-uploaded content. The scope change in the CVSS vector indicates that the vulnerability could affect resources beyond the initially compromised component, potentially allowing attackers to escalate privileges or move laterally within the network. European organizations with strict compliance requirements and high-value web assets would be particularly impacted, as exploitation could lead to regulatory penalties and loss of customer trust.

1. Immediately restrict file upload permissions to trusted users only and implement strict validation on file types and content to prevent dangerous file uploads. 2. Employ server-side filtering and sanitization of uploaded files, including MIME type verification and content inspection to block executable scripts or files masquerading as safe types. 3. Educate administrators to avoid opening or interacting with user-uploaded files directly in browsers until the vulnerability is patched. 4. Monitor logs for unusual file upload activity and access patterns to detect potential exploitation attempts early. 5. Deploy Content Security Policy (CSP) headers to limit the impact of any script execution in browsers. 6. Isolate the CMS administrative interface from general user upload areas to reduce exposure. 7. Prepare for patch deployment by closely monitoring Alfasado Inc. announcements and applying updates as soon as they become available. 8. Consider implementing multi-factor authentication (MFA) for administrative accounts to reduce the risk of session hijacking. 9. Conduct regular security audits and penetration testing focusing on file upload functionalities.