CVE-2025-53760 is a Server-Side Request Forgery (SSRF) vulnerability identified in Microsoft SharePoint Enterprise Server 2016, specifically version 16.0.0. SSRF vulnerabilities occur when an attacker can abuse a server to send crafted requests to internal or external systems that the server can access, potentially bypassing network access controls. In this case, the vulnerability allows an authorized attacker—meaning the attacker must have some level of legitimate access—to leverage SharePoint's request handling mechanisms to perform unauthorized actions over the network. The vulnerability is classified under CWE-918, which pertains to SSRF issues. The CVSS 3.1 base score is 7.1 (high severity), indicating a significant risk. The vector details show the attack can be performed remotely over the network (AV:N), requires low attack complexity (AC:L), and requires privileges (PR:L) but no user interaction (UI:N). The impact primarily affects confidentiality (C:H), with limited integrity impact (I:L) and no availability impact (A:N). This suggests that an attacker can potentially access sensitive information or internal resources that should be protected, but cannot significantly alter data or disrupt services. No known exploits are currently reported in the wild, and no patches or mitigation links are provided yet, indicating this is a newly published vulnerability as of August 2025. The vulnerability could be exploited to elevate privileges within the network environment, potentially allowing lateral movement or access to sensitive internal systems through SharePoint's network capabilities.

For European organizations, especially those using Microsoft SharePoint Enterprise Server 2016, this vulnerability poses a significant risk to confidentiality of internal data and network resources. SharePoint is widely used in enterprises for document management and collaboration, often containing sensitive corporate and personal data protected under GDPR. Exploitation could lead to unauthorized access to internal systems, exposing confidential information and potentially leading to data breaches with regulatory and reputational consequences. The fact that the attacker must be authorized limits the risk to insiders or compromised accounts, but given the prevalence of phishing and credential theft, this barrier may be overcome by attackers. The vulnerability could facilitate lateral movement within corporate networks, increasing the risk of broader compromise. European organizations with complex internal networks and segmented environments may find this SSRF particularly dangerous as it can bypass network segmentation controls. The absence of known exploits currently provides a window for proactive mitigation, but the high severity score demands urgent attention.

1. Immediate review and restriction of SharePoint user privileges to the minimum necessary, reducing the number of authorized users who could exploit this SSRF. 2. Implement network-level segmentation and firewall rules to limit SharePoint server outbound requests to only trusted internal and external endpoints, minimizing the attack surface for SSRF exploitation. 3. Monitor SharePoint logs and network traffic for unusual outbound requests or patterns indicative of SSRF attempts. 4. Apply any forthcoming patches or security updates from Microsoft as soon as they become available; in the meantime, consider temporary workarounds such as disabling or restricting vulnerable SharePoint features if feasible. 5. Employ multi-factor authentication (MFA) to reduce the risk of account compromise that could lead to exploitation by authorized attackers. 6. Conduct internal security awareness training to reduce phishing and credential theft risks that could lead to attacker authorization. 7. Use web application firewalls (WAFs) with SSRF detection capabilities to help detect and block malicious requests targeting SharePoint. 8. Regularly audit SharePoint configurations and permissions to ensure adherence to least privilege principles and detect any unauthorized changes.