CVE-2025-60735 is a security vulnerability identified in PerfreeBlog version 4.0.11, specifically within the installPlugin function. This vulnerability is classified as a file upload flaw, which typically allows an attacker to upload malicious files to the server. Such files can include web shells or scripts that enable remote code execution, privilege escalation, or unauthorized access to sensitive data. The vulnerability arises due to insufficient validation or sanitization of uploaded files during the plugin installation process. Although no CVSS score has been assigned yet, the nature of file upload vulnerabilities often leads to critical security breaches. No patches or fixes have been publicly disclosed at the time of publication, and no known exploits are reported in the wild, indicating this is a newly disclosed issue. The vulnerability does not require authentication or user interaction, increasing its risk profile. Attackers exploiting this flaw could compromise the confidentiality, integrity, and availability of affected systems. PerfreeBlog is a blogging platform, and organizations using it for web content management may expose their infrastructure to attacks if unpatched. The lack of detailed affected versions beyond 4.0.11 suggests that this specific version is vulnerable, but other versions should be reviewed for similar issues. The vulnerability was reserved in late September 2025 and published in October 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses significant risks, especially for those relying on PerfreeBlog for their web presence or content management. Successful exploitation could lead to unauthorized remote code execution, allowing attackers to manipulate website content, steal sensitive information, or use compromised servers as pivot points for further network intrusion. This could result in data breaches, defacement of websites, loss of customer trust, and potential regulatory penalties under GDPR if personal data is exposed. The availability of the service could also be disrupted, impacting business continuity. Given that no authentication is required to exploit the vulnerability, attackers can target publicly accessible PerfreeBlog installations with relative ease. Organizations in sectors such as media, education, and small to medium enterprises that commonly use blogging platforms may be particularly vulnerable. The absence of known exploits currently provides a window for proactive mitigation, but the risk of future exploitation remains high.

Organizations should immediately inventory their web infrastructure to identify any PerfreeBlog 4.0.11 installations. Until an official patch is released, administrators should restrict file upload permissions on the server, especially for directories involved in plugin installation. Implementing strict server-side validation to check file types, sizes, and content signatures can reduce the risk of malicious uploads. Employing web application firewalls (WAFs) with rules to detect and block suspicious file upload attempts is recommended. Monitoring server logs for unusual activity related to file uploads or plugin installations can help detect exploitation attempts early. Isolating the blogging platform in a segmented network zone limits potential lateral movement if compromised. Regular backups of web content and configurations should be maintained to enable rapid recovery. Once a patch or update is available from PerfreeBlog developers, it should be applied promptly. Additionally, educating web administrators about this vulnerability and encouraging vigilance against suspicious activity will strengthen defenses.