CVE-2025-60735 identifies a file upload vulnerability in the installPlugin function of PerfreeBlog version 4.0.11. This vulnerability falls under CWE-434, indicating an unrestricted file upload flaw that allows attackers to upload files without proper validation or restriction. The vulnerability can be exploited remotely over the network (AV:N) with low attack complexity (AC:L), requiring only low privileges (PR:L) and no user interaction (UI:N). The scope is unchanged (S:U), meaning the impact is confined to the vulnerable component. The CVSS score of 7.6 reflects a high severity, with a high impact on confidentiality (C:H), limited impact on integrity (I:L), and low impact on availability (A:L). An attacker exploiting this flaw could upload malicious files such as web shells or scripts, potentially leading to unauthorized data access or partial system compromise. Although no known exploits are currently reported in the wild and no patches have been released, the vulnerability poses a significant risk due to the ease of exploitation and the critical nature of file upload flaws in web applications. The lack of published patches necessitates immediate interim mitigations and monitoring. The vulnerability affects PerfreeBlog installations, a blogging platform that may be used by various organizations for content management. Given the nature of the flaw, attackers could leverage it to gain unauthorized access or execute arbitrary code, threatening the confidentiality and integrity of affected systems.

For European organizations using PerfreeBlog, this vulnerability could lead to unauthorized access to sensitive data, defacement of websites, or partial system compromise. The high confidentiality impact means that sensitive information stored or processed by the blog platform could be exposed. The limited integrity and availability impacts suggest that while full system takeover is less likely, attackers could still disrupt services or alter content. Organizations with publicly accessible PerfreeBlog installations are particularly vulnerable, as the attack vector is remote and requires no user interaction. This could affect sectors relying on PerfreeBlog for communication or marketing, including SMEs and media companies. The absence of patches increases the risk window, potentially inviting targeted attacks or opportunistic exploitation. Additionally, exploitation could serve as a foothold for lateral movement within networks, amplifying the threat to broader IT infrastructure.

1. Immediately restrict file upload capabilities in the installPlugin function by implementing strict file type validation and sanitization to allow only safe file formats. 2. Enforce strong access controls and authentication mechanisms to limit who can invoke the installPlugin function, ideally restricting it to trusted administrators only. 3. Monitor web server logs and upload directories for suspicious or unexpected file uploads, employing automated detection tools where possible. 4. Isolate PerfreeBlog installations in segmented network zones to limit potential lateral movement if compromised. 5. Regularly back up website data and configurations to enable rapid recovery in case of compromise. 6. Engage with PerfreeBlog developers or community to obtain patches or updates addressing this vulnerability as soon as they become available. 7. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block malicious upload attempts targeting this vulnerability. 8. Educate administrators about the risks of file upload vulnerabilities and the importance of applying security best practices in plugin management.