CVE-2025-60731 is a security vulnerability identified in PerfreeBlog version 4.0.11, specifically within the installTheme function. This function is responsible for handling theme installation, which involves uploading files to the server. The vulnerability allows an attacker to upload arbitrary files without proper validation or restrictions, leading to a file upload vulnerability. Such vulnerabilities are critical because they can enable attackers to upload malicious scripts or executables, which can then be executed on the server, resulting in remote code execution (RCE), privilege escalation, or unauthorized data access. The vulnerability was reserved on September 26, 2025, and published on October 24, 2025, but currently lacks a CVSS score and no public exploits have been reported. The absence of a patch link suggests that a fix may not yet be available, increasing the urgency for organizations to implement interim mitigations. The vulnerability does not require authentication or user interaction, making it easier for attackers to exploit remotely. Given PerfreeBlog's role as a blogging platform, the affected systems are likely web servers hosting blogs or websites, which are often exposed to the internet and thus accessible to attackers. The lack of detailed affected versions beyond 4.0.11 suggests that this version is confirmed vulnerable, but other versions may also be at risk pending further analysis.

For European organizations, the impact of this vulnerability can be significant. Successful exploitation could lead to unauthorized file uploads, enabling attackers to execute arbitrary code on web servers, compromise sensitive data, deface websites, or use the compromised server as a pivot point for further attacks within the network. This can result in data breaches, reputational damage, service disruption, and potential regulatory penalties under GDPR if personal data is exposed. Organizations relying on PerfreeBlog for public-facing content are particularly vulnerable due to the internet-facing nature of these systems. The ease of exploitation without authentication increases the risk of widespread attacks. Additionally, the lack of a current patch means organizations must rely on mitigations to reduce exposure. The impact extends beyond individual organizations to potentially affect their customers and partners, amplifying the threat landscape in the European digital ecosystem.

1. Immediately restrict or disable the installTheme function or any file upload functionality within PerfreeBlog until a patch is available. 2. Implement strict server-side validation and sanitization of all uploaded files, ensuring only allowed file types and sizes are accepted. 3. Configure web server permissions to prevent execution of uploaded files in upload directories, using techniques such as disabling script execution or placing uploads outside the web root. 4. Monitor web server logs for unusual file upload activity or access patterns indicative of exploitation attempts. 5. Employ web application firewalls (WAFs) with rules designed to detect and block malicious file uploads targeting PerfreeBlog. 6. Keep PerfreeBlog installations and all related software up to date and subscribe to vendor advisories for timely patch releases. 7. Conduct regular security assessments and penetration testing focused on file upload mechanisms. 8. Educate administrators and developers about secure file upload practices and the risks associated with this vulnerability. 9. Consider isolating PerfreeBlog instances in segmented network zones to limit lateral movement in case of compromise.