CVE-2026-85612 in OpenPanel
Summary
by MITRE • 09/04/2026
OpenPanel before 2.3.0 contains an unauthenticated server-side request forgery vulnerability in the /misc/favicon and /misc/og endpoints that accept an attacker-supplied url parameter with insufficient validation. Attackers can force the API to fetch arbitrary internal hosts and cloud metadata endpoints, with small responses returned verbatim enabling credential theft and internal service enumeration.
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Analysis
by VulDB Data Team • 09/04/2026
The identified vulnerability in OpenPanel versions prior to 2.3.0 represents a critical server-side request forgery flaw located within the /misc/favicon and /misc/og API endpoints. This weakness stems from insufficient input validation on the url parameter, which allows unauthenticated attackers to inject arbitrary Uniform Resource Locators into the application's backend processing logic. By manipulating this parameter, an adversary can compel the OpenPanel server to initiate HTTP requests to destinations of their choosing rather than fetching legitimate static assets or social media metadata as intended by the design. This lack of strict allow-listing for destination hosts constitutes a fundamental failure in input validation and URL parsing mechanisms, enabling the application to act as a proxy for malicious network activity without requiring any form of user authentication or session verification.
The operational impact of this vulnerability is severe due to its potential for credential theft and internal service enumeration. Attackers can leverage this unauthenticated SSRF vector to target cloud metadata endpoints, such as those found in AWS EC2 instances (e.g., 169.254.169.254), Azure managed identities, or Google Cloud instance metadata services. These endpoints often expose sensitive configuration data and temporary security credentials that are not protected by network firewalls because they reside on the loopback interface. By forcing the OpenPanel server to fetch these internal resources, an attacker can retrieve access keys, IAM roles, and other authentication tokens directly from the response body. Furthermore, this capability allows for extensive reconnaissance of the internal network topology, as the application can be directed to probe various internal IP addresses and ports, revealing running services, open ports, and potentially vulnerable applications that are otherwise inaccessible from external networks.
From a classification perspective, this vulnerability aligns with CWE-918, which defines Server-Side Request Forgery (SSRF), specifically highlighting the failure to restrict URLs to expected domains or internal resources. The exploitation technique maps directly to MITRE ATT&CK tactic T1557, known as Adversary-in-the-Middle, where the attacker uses a trusted application to intercept and relay communications between two parties. In this context, OpenPanel serves as the intermediary that facilitates unauthorized access to sensitive backend systems. Additionally, the ability to enumerate internal services relates to ATT&CK technique T1046, Network Service Discovery, which adversaries employ to map out network infrastructure for further exploitation. The unauthenticated nature of the attack also underscores a failure in authentication controls, though the primary risk vector is the SSRF mechanism itself rather than a bypass of login screens.
Mitigation strategies must prioritize immediate patching and architectural hardening. Organizations running OpenPanel should upgrade to version 2.3.0 or later as soon as possible, as this release addresses the validation logic for URL parameters in the affected endpoints. In scenarios where upgrading is not immediately feasible, network-level controls such as egress filtering can be implemented to restrict outbound connections from the server hosting OpenPanel. This involves configuring firewalls to block access to known cloud metadata IP ranges and restricting internal service discovery by limiting allowed destinations to a strict whitelist of approved domains. Additionally, implementing web application firewall rules that detect and block requests containing suspicious URL patterns or attempts to access loopback addresses can provide an additional layer of defense against exploitation while permanent fixes are deployed.