OpenPanel before 2.3.0 contains an unauthenticated server-side request forgery vulnerability in the GET /tools/site-checker endpoint that accepts a fully client-controlled URL parameter with no private IP filtering or DNS-rebinding protection. Attackers can make the OpenPanel server issue requests to internal services, localhost, and cloud metadata endpoints, reading internal HTTP response titles, headers, status codes, and SSL certificate information.

OpenPanel versions before 2.3.0 contain an unauthenticated Server-Side Request Forgery (SSRF) vulnerability in the GET /tools/site-checker endpoint. The endpoint accepts a fully client-controlled URL parameter without any private IP filtering or DNS-rebinding protection. Attackers can exploit this to make the OpenPanel server issue arbitrary HTTP requests to internal services, localhost, and cloud metadata endpoints (e.g., AWS/GCP/Azure IMDS). The vulnerability exposes internal HTTP response titles, headers, status codes, and SSL certificate information. No authentication is required to trigger the vulnerability, significantly lowering the barrier for exploitation. The issue has been addressed in OpenPanel version 2.3.0. A GitHub Security Advisory (GHSA-gqcr-xgfj-pq29) and a VulnCheck advisory have been published alongside the NVD entry.