CVE-2026-76177 in Ocsreports
Summary
by MITRE • 09/03/2026
Server-Side Request Forgery (SSRF) vulnerability in the /ocsreports/?function=tele_activate endpoint due to insufficient validation of the HTTPS_SERV and FILE_SERV parameters. An authenticated user with operator privileges can provide arbitrary values for these parameters, causing the OCS Inventory server to make HTTP/HTTPS requests to external systems or internal resources, which could allow access to internal network services or metadata resources of cloud services.
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Analysis
by VulDB Data Team • 09/03/2026
The identified vulnerability constitutes a Server-Side Request Forgery flaw within the OCS Inventory management platform, specifically targeting the tele_activate function endpoint located at /ocsreports/. This security weakness stems from an insufficient validation mechanism applied to the HTTPS_SERV and FILE_SERV parameters passed by authenticated users. In a secure implementation, these parameters should be strictly validated against a whitelist of allowed domains or internal IP ranges to prevent the server from acting as a proxy for arbitrary requests. However, due to this lack of rigorous input sanitization, an attacker with operator-level privileges can inject malicious values into these fields. When the application processes these inputs, it constructs and executes HTTP or HTTPS requests on behalf of the backend server, effectively allowing the attacker to dictate the destination address of the outgoing traffic.
The operational impact of this vulnerability is significant because it bypasses traditional network perimeter defenses that rely on IP-based filtering for outbound connections. Since the request originates from the OCS Inventory server itself, it can traverse internal firewalls and access services that are not exposed to the public internet. This capability enables an attacker to perform reconnaissance against internal infrastructure by scanning local subnets or accessing sensitive administrative interfaces of other systems within the same network segment. Furthermore, in cloud environments, this flaw allows for the retrieval of instance metadata, which often contains critical authentication credentials, API keys, and configuration details necessary to escalate privileges further into the cloud environment. The requirement for operator-level authentication means that any compromised account with these specific permissions can be leveraged to execute these attacks, making it a viable path for lateral movement within an organization's IT infrastructure.
From a classification perspective, this vulnerability aligns directly with CWE-918, which defines Server-Side Request Forgery as the server-side application fetching a resource that is not intended by the user. The exploitation technique maps to MITRE ATT&CK tactic T1557, specifically Adversary-in-the-Middle or Lateral Tool Transfer if used in conjunction with other exploits, but more accurately fits under reconnaissance techniques such as Network Service Discovery (T1046) and Cloud Infrastructure Discovery (T1580). The attacker utilizes the vulnerable application to probe internal network services, effectively turning a legitimate administrative tool into an offensive vector. This scenario highlights the risk of over-privileged accounts being used to pivot through trusted applications that have outbound connectivity capabilities.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Administrators should immediately apply vendor-provided patches if available for the specific version of OCS Inventory affected. In cases where patching is not immediately feasible, network-level controls such as egress filtering can be implemented to restrict outbound connections from the application server to only known and necessary destinations. Additionally, implementing a Web Application Firewall with rules capable of detecting SSRF patterns in HTTP parameters can provide an additional layer of defense. From a development standpoint, future updates must enforce strict allow-listing for all user-supplied URLs or hostnames used by backend services. Input validation should reject any input that does not match predefined safe domains and block requests to private IP address ranges commonly associated with internal networks and cloud metadata endpoints. Regular security audits focusing on server-side request handling are essential to prevent similar vulnerabilities in other modules of the application.