CVE-2025-60355 is a vulnerability identified in the OneBlog content management system (CMS) prior to version 2.3.9, specifically related to the use of FreeMarker templates. The vulnerability is classified as a Server-Side Template Injection (SSTI), which occurs when user input is unsafely embedded into server-side templates, allowing attackers to inject malicious template directives. FreeMarker, a Java-based template engine, is commonly used to generate dynamic web content. When improperly sanitized, it can be manipulated to execute arbitrary code on the server, leading to remote code execution (RCE). This vulnerability enables attackers to execute system commands, access sensitive data, or pivot within the network. Although no CVSS score or known exploits are currently documented, the nature of SSTI vulnerabilities typically allows unauthenticated attackers to exploit the flaw remotely without user interaction. The lack of patch links suggests that remediation is available in OneBlog version 2.3.9 or later, which presumably addresses the unsafe template handling. Organizations running OneBlog instances with vulnerable versions are at risk, especially if the CMS is exposed to the internet. The vulnerability was reserved on 2025-09-26 and published on 2025-10-28, indicating recent discovery and disclosure. Due to the absence of known exploits, proactive patching and code review are critical to prevent future attacks.

For European organizations, the impact of CVE-2025-60355 could be substantial. Exploitation could lead to unauthorized remote code execution, resulting in data breaches, defacement, or full system compromise. This could disrupt business operations, damage reputation, and lead to regulatory penalties under GDPR if personal data is exposed. Organizations relying on OneBlog for public-facing websites or internal portals are particularly vulnerable. Attackers could leverage the vulnerability to move laterally within networks, escalate privileges, or deploy ransomware. The risk is heightened for sectors with critical infrastructure or sensitive data, such as finance, healthcare, and government. Additionally, the lack of authentication and user interaction requirements makes the attack vector easier to exploit, increasing the threat surface. The absence of known exploits currently provides a window for mitigation before widespread attacks occur.

To mitigate CVE-2025-60355, organizations should immediately upgrade OneBlog installations to version 2.3.9 or later, where the vulnerability is patched. Conduct a thorough audit of all template usage to ensure no unsanitized user input is passed to FreeMarker templates. Implement strict input validation and output encoding to prevent injection of malicious template directives. Restrict access to the CMS administration interface and limit exposure to the internet where possible. Employ web application firewalls (WAFs) with rules targeting SSTI patterns to detect and block exploitation attempts. Monitor logs for unusual template rendering errors or suspicious requests. Regularly update and patch all components of the CMS and underlying infrastructure. Educate developers and administrators about secure template handling practices. Finally, consider deploying runtime application self-protection (RASP) solutions to detect and prevent exploitation in real time.