CVE-2026-70332 in SharePoint
Summary
by MITRE • 08/07/2026
Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
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Analysis
by VulDB Data Team • 08/07/2026
Server-side request forgery vulnerabilities in Microsoft Office SharePoint represent a critical security weakness that enables unauthorized attackers to manipulate the server's behavior by making it initiate requests to arbitrary destinations. This particular vulnerability stems from insufficient validation of user-supplied input within SharePoint's request handling mechanisms, allowing malicious actors to craft specially formatted requests that bypass normal access controls and authentication checks.
The technical flaw manifests when SharePoint servers process user-provided URLs or network addresses without adequate sanitization or destination verification. Attackers can exploit this by constructing requests that appear legitimate to the SharePoint server but actually direct it to internal systems or external malicious endpoints. This occurs because the server-side processing logic fails to properly validate the intended destination of outgoing requests, creating a pathway for attackers to leverage the server's network access privileges for unauthorized operations.
The operational impact of such vulnerabilities extends beyond simple data exfiltration to encompass comprehensive network reconnaissance and lateral movement capabilities. An attacker can use SSRF to map internal network topologies by targeting internal services that would otherwise be inaccessible from external networks. This enables the exploitation of other vulnerabilities within the internal infrastructure, as well as potential credential harvesting through attacks against internal authentication systems. The vulnerability also facilitates spoofing operations where attackers can manipulate responses or intercept communications between internal services.
From a threat modeling perspective, this vulnerability aligns with CWE-918 which specifically addresses server-side request forgery and maps to ATT&CK technique T1071.004 for application layer protocol manipulation. The attack surface is particularly concerning in enterprise environments where SharePoint servers often maintain access to sensitive internal resources. Organizations may inadvertently expose critical systems through this vulnerability, as the server's legitimate network access privileges can be abused to target internal databases, file servers, or other privileged systems.
Mitigation strategies should focus on implementing comprehensive input validation and destination verification mechanisms within SharePoint's request processing pipelines. Organizations must deploy strict URL filtering rules that prevent requests to internal IP ranges or known malicious domains, while also implementing network segmentation to limit the scope of potential exploitation. Regular security updates and patches from Microsoft should be applied immediately upon release, as these vulnerabilities are typically addressed through server-side code modifications that strengthen validation controls. Additionally, organizations should conduct regular penetration testing to identify potential SSRF vectors within their SharePoint environments and implement monitoring solutions to detect anomalous request patterns that may indicate exploitation attempts.