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 manipulate a server to send crafted requests to internal or external systems that the attacker cannot directly access. In this case, an authorized attacker with network access and some privileges on the SharePoint server can exploit this flaw to coerce the server into making unintended HTTP requests. This can lead to privilege escalation by accessing sensitive internal resources, potentially bypassing network segmentation or firewall rules. The vulnerability is classified under CWE-918, which covers SSRF issues. The CVSS v3.1 base score is 7.1, indicating a high severity level. The vector details show that the attack can be performed remotely over the network (AV:N), requires low complexity (AC:L), and requires privileges (PR:L) but no user interaction (UI:N). The scope is unchanged (S:U), with high confidentiality impact (C:H), low integrity impact (I:L), and no availability impact (A:N). No known public exploits are currently reported, but the vulnerability is published and should be considered a significant risk. The absence of patch links suggests that a fix may be forthcoming or pending deployment. This vulnerability is particularly concerning for organizations relying on SharePoint 2016 for collaboration and document management, as it could allow attackers to pivot within internal networks or access sensitive data not normally exposed externally.

For European organizations, the impact of CVE-2025-53760 can be substantial. SharePoint is widely used across enterprises, government agencies, and critical infrastructure sectors in Europe for document management and collaboration. Exploitation of this SSRF vulnerability can lead to unauthorized access to internal systems, potentially exposing sensitive data such as intellectual property, personal data protected under GDPR, or confidential communications. The ability to escalate privileges over the network increases the risk of lateral movement within corporate networks, potentially leading to broader compromise. While the vulnerability does not directly affect availability, the confidentiality breach alone can have severe regulatory and reputational consequences. Organizations in sectors like finance, healthcare, government, and manufacturing, which heavily rely on SharePoint, are particularly at risk. Additionally, the requirement for some level of privileges means that insider threats or compromised accounts could be leveraged to exploit this vulnerability, increasing the threat surface. The lack of known exploits in the wild currently provides a window for proactive mitigation before widespread attacks occur.

1. Apply official security patches from Microsoft as soon as they become available for SharePoint Enterprise Server 2016. Monitor Microsoft security advisories closely. 2. Restrict network access to SharePoint servers, limiting outbound HTTP requests to only trusted internal resources and blocking unnecessary external requests to reduce SSRF attack vectors. 3. Implement strict access controls and monitor privileged accounts to minimize the risk of attackers gaining the required privileges to exploit this vulnerability. 4. Use web application firewalls (WAFs) with SSRF detection capabilities to detect and block suspicious request patterns originating from SharePoint servers. 5. Conduct regular security audits and network segmentation reviews to ensure that SharePoint servers cannot be used as pivot points to access sensitive internal systems. 6. Enable detailed logging and monitoring of SharePoint server activities to detect anomalous request behaviors indicative of SSRF exploitation attempts. 7. Educate administrators and security teams about this vulnerability to ensure rapid response and incident handling if exploitation is suspected.