CVE-2026-85609 in Openpanel
Summary
by MITRE • 09/04/2026
Openpanel before 2.3.0 contains an unauthenticated full-read server-side request forgery (SSRF) vulnerability in the GET /tools/site-checker endpoint (apps/api/src/controllers/tools.controller.ts). The endpoint passes a user-supplied url query parameter to fetchWithRedirects() and performs server-side HTTP requests to arbitrary URLs without any SSRF/IP validation. An unauthenticated remote attacker can access cloud instance metadata endpoints, probe internal services, scan internal network ports, and read returned content (status code, page size, timing, and parsed HTML metadata), and leak internal IP addresses (via getIPInfo() to a third party).
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in Openpanel versions prior to 2.3.0 represents a critical server-side request forgery flaw located within the GET /tools/site-checker endpoint, specifically implemented in the apps/api/src/controllers/tools.controller.ts module. This security defect stems from an unauthenticated full-read SSRF condition where the application accepts a user-supplied URL parameter and directly passes it to the fetchWithRedirects function without implementing any form of input validation or access control mechanisms. The absence of server-side request filtering allows remote attackers to manipulate the destination address, protocol, and port used by the backend server when making HTTP requests. This lack of restriction is particularly severe because it operates without requiring authentication, thereby lowering the barrier for exploitation significantly and allowing any internet-facing actor with network connectivity to the application interface to initiate malicious outbound connections from the vulnerable server infrastructure.
From a technical perspective, the core issue lies in the failure to enforce strict allowlists or deny lists on the target URLs provided by clients. By bypassing SSRF protections such as IP address validation, domain name verification, and protocol restrictions, the application effectively acts as an open proxy for arbitrary network requests. This architectural flaw enables attackers to leverage the server's own identity and network permissions to interact with internal resources that are typically isolated from public access. The vulnerability aligns closely with CWE-918, which describes Server-Side Request Forgery (SSRF) flaws where a web application fetches a remote resource without validating the user-supplied URL, leading to unauthorized data retrieval or system compromise. Furthermore, this exploitation path maps directly to MITRE ATT&CK technique T1571, specifically reflecting behaviors associated with non-Standard Port Communication and potentially T1046 if used for network service discovery within an internal environment.
The operational impact of this vulnerability is extensive due to the breadth of information that can be exfiltrated through successful exploitation. Attackers can target cloud instance metadata endpoints, such as those found in AWS EC2 or Azure Managed Instance Service, which often contain sensitive configuration data, temporary credentials, and IAM role assignments. By probing internal services, an attacker can map out the internal network topology, identifying active hosts and running services that are not intended to be exposed externally. The ability to scan internal network ports allows for further reconnaissance of backend infrastructure, potentially revealing vulnerable legacy systems or misconfigured databases. Additionally, because the application returns detailed response data including status codes, page sizes, timing information, and parsed HTML metadata, an attacker can perform blind SSRF techniques to infer the existence and nature of internal services even if direct content access is restricted by certain security controls.
A particularly dangerous consequence of this flaw is the potential for IP address leakage through the getIPInfo() function when interacting with third-party services. This mechanism inadvertently exposes the public-facing or private IP addresses associated with the server's network interfaces, providing attackers with valuable intelligence about the deployment environment and network segmentation strategies. Such information facilitates more targeted attacks against specific internal assets identified during the initial SSRF probing phase. The combination of unauthenticated access, lack of URL validation, and rich response feedback creates a high-severity risk that can lead to full system compromise if combined with other vulnerabilities or used as an entry point for lateral movement within a compromised network segment.
To mitigate this vulnerability, immediate patching to Openpanel version 2.3.0 or later is required, as the developers have addressed these input validation gaps in subsequent releases. In environments where upgrading is not immediately feasible, defensive measures should include implementing strict allowlists for outbound HTTP requests at both the application and network levels. Application-level controls must validate that all requested URLs resolve to approved domains and do not target private IP ranges or cloud metadata endpoints using techniques such as DNS rebinding protection and URL parsing validation before any request is initiated. Network-level mitigations involve configuring firewalls or reverse proxies to restrict outbound traffic from the web server application layer, permitting connections only to explicitly defined external APIs while blocking access to internal subnets and loopback addresses. Regular security audits focusing on SSRF prevention patterns are also recommended to ensure that similar architectural weaknesses do not exist in other parts of the codebase.