CVE-2026-87116 in Threat Response
Summary
by MITRE • 09/16/2026
Tanium addressed a server-side request forgery vulnerability in Threat Response.
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Analysis
by VulDB Data Team • 09/16/2026
A critical security flaw was identified within the Tanium platform's Threat Response module, specifically manifesting as a Server-Side Request Forgery (SSRF) vulnerability. This type of attack allows an attacker to induce the server application to make HTTP requests to arbitrary domains or internal network resources that would otherwise be inaccessible directly from the internet. In this specific instance, the vulnerability stems from insufficient validation and sanitization of user-supplied input used in constructing outbound network connections initiated by the Threat Response service. By manipulating these inputs, a malicious actor can trick the server into fetching content from internal services, such as cloud metadata endpoints, internal APIs, or other sensitive backend systems that are not exposed to public networks but are reachable via the local loopback interface or internal subnet routing.
The operational impact of this vulnerability is severe due to Tanium's privileged position within enterprise environments. As a comprehensive endpoint detection and response (EDR) solution, Tanium possesses deep visibility into network traffic and system states across an organization. An attacker who successfully exploits this SSRF flaw can leverage the server's elevated privileges and internal connectivity to perform reconnaissance against other assets on the local network. This could lead to the exfiltration of sensitive data stored in internal services, such as configuration files containing credentials or secrets hosted on metadata servers like those found in AWS EC2 or Azure VMs. Furthermore, the attacker might be able to interact with internal management interfaces, potentially leading to further compromise of adjacent systems and lateral movement within the network perimeter.
From a classification perspective, this vulnerability aligns closely with CWE-918, which defines Server-Side Request Forgery as a weakness where web applications retrieve data from a server specified by the user without validating that request. The exploitation technique also maps to MITRE ATT&CK techniques related to Network Service Discovery and Data Staged for Exfiltration over C2 Channels, specifically T1046 (Network Service Scanning) if used for reconnaissance, or T1537 (Transfer Data to Cloud Account) if the SSRF is leveraged to push data out via cloud metadata services. The lack of strict allow-listing for outbound connections represents a fundamental failure in input validation controls that are critical for securing server-side applications handling sensitive operational tasks.
To mitigate this risk, Tanium has released updates that enforce stricter validation rules on all inputs used to generate outbound requests within the Threat Response module. Administrators should immediately apply these patches or upgrade their Tanium platform versions to include the fix. In addition to patching, organizations are advised to implement network-level controls such as egress filtering and proxy servers that restrict which internal IP ranges and domains can be accessed by application servers. This defense-in-depth approach ensures that even if an SSRF vulnerability is present in a future release, its impact will be significantly contained by limiting the server's ability to communicate with unauthorized or sensitive internal resources. Regular security audits of outbound connection logic within critical infrastructure components remain essential for maintaining robust cybersecurity posture against evolving threat vectors.