CVE-2025-67623 is a Server-Side Request Forgery (SSRF) vulnerability identified in the 6Storage Rentals product, specifically affecting versions up to and including 2.19.9. SSRF vulnerabilities occur when an attacker can manipulate a server to send crafted requests to unintended locations, often internal network resources or external systems that the server can access but the attacker cannot directly reach. In this case, the vulnerability allows an attacker to coerce the 6Storage Rentals server into making arbitrary HTTP or other protocol requests, potentially exposing sensitive internal services or metadata endpoints. The vulnerability does not require authentication or user interaction, which lowers the barrier for exploitation. Although no public exploits have been reported yet, the flaw's presence in a rental management platform used for storage services could allow attackers to perform reconnaissance, access internal APIs, or pivot to other systems within the network. The lack of a CVSS score suggests the need for a manual severity assessment. The vulnerability's impact includes potential unauthorized data access, bypassing firewall rules, and facilitating further attacks such as remote code execution if combined with other flaws. The absence of patches at the time of publication necessitates immediate attention to monitoring and mitigation strategies. The vulnerability was reserved and published in December 2025, indicating recent discovery and disclosure.

For European organizations, the SSRF vulnerability in 6Storage Rentals poses significant risks, especially for those relying on this platform for managing storage or rental services. Exploitation could lead to unauthorized access to internal systems, exposing sensitive customer or operational data. This could result in confidentiality breaches, disruption of services, or manipulation of backend processes. Given the nature of SSRF, attackers might leverage this vulnerability to bypass perimeter defenses, access cloud metadata services, or escalate privileges within the network. Organizations in sectors such as logistics, warehousing, and rental services that use 6Storage Rentals could face operational disruptions and reputational damage. Additionally, compliance with GDPR and other data protection regulations could be jeopardized if personal data is exposed. The lack of known exploits currently provides a window for proactive defense, but the ease of exploitation without authentication increases urgency. The overall impact is heightened in environments with poor network segmentation or insufficient input validation.

To mitigate CVE-2025-67623, European organizations should prioritize the following actions: 1) Monitor vendor communications closely and apply security patches immediately once available for 6Storage Rentals. 2) Implement strict input validation and sanitization on all user-controllable parameters that influence server-side requests to prevent injection of malicious URLs. 3) Employ network segmentation to isolate critical internal services and restrict outbound traffic from application servers to only necessary destinations, minimizing SSRF attack surface. 4) Use web application firewalls (WAFs) with rules designed to detect and block SSRF patterns. 5) Conduct regular security assessments and penetration testing focused on SSRF and related vulnerabilities within the 6Storage Rentals environment. 6) Review and harden cloud metadata service access controls if the platform is hosted in cloud environments. 7) Educate development and operations teams about SSRF risks and secure coding practices. These measures, combined with vigilant monitoring for unusual outbound requests, will reduce the likelihood and impact of exploitation.