CVE-2026-27797 is a Server-Side Request Forgery (SSRF) vulnerability identified in the Homarr open-source dashboard software developed by homarr-labs. The vulnerability exists in versions prior to 1.54.0 and allows an unauthenticated remote attacker to coerce the Homarr server into making arbitrary HTTP requests to external or internal network resources. SSRF vulnerabilities occur when an application accepts a user-supplied URL or resource identifier and fetches it server-side without proper validation or filtering. In this case, the attacker can exploit this behavior to access internal network services that are otherwise inaccessible externally, such as services on loopback addresses (127.0.0.1) or private IP ranges (e.g., 10.x.x.x, 192.168.x.x). This can be leveraged for reconnaissance, accessing sensitive internal APIs, or pivoting further into the network. The vulnerability does not require any authentication or user interaction, increasing its risk profile. The CVSS v3.1 base score is 5.3 (medium), reflecting the network attack vector, low complexity, no privileges required, and no user interaction needed. The impact is limited to confidentiality as the attacker can potentially retrieve internal information but cannot modify data or disrupt service directly. The vulnerability was publicly disclosed and patched in version 1.54.0 of Homarr. No known active exploits have been reported yet. Homarr is often deployed as a dashboard interface in containerized or internal environments, making internal network exposure a significant concern if the vulnerable version is internet-accessible.

The primary impact of this SSRF vulnerability is unauthorized information disclosure from internal network resources that are normally inaccessible from outside the network. Attackers can leverage this to enumerate internal services, access metadata endpoints (such as cloud provider metadata APIs), or interact with internal management interfaces. This can lead to further compromise if sensitive information or credentials are exposed. While the vulnerability does not directly allow code execution or denial of service, the ability to reach internal systems can facilitate lateral movement or privilege escalation in complex environments. Organizations exposing Homarr dashboards to untrusted networks or the internet face increased risk. Containerized deployments may also be at risk if network segmentation is insufficient. The medium CVSS score reflects moderate risk, but the actual impact depends on the internal network architecture and what services are accessible from the Homarr host. Since no authentication is required, any attacker with network access to the vulnerable Homarr instance can exploit this flaw, increasing the attack surface.

The primary mitigation is to upgrade Homarr to version 1.54.0 or later, where this SSRF vulnerability has been patched. Until an upgrade can be performed, organizations should restrict network access to the Homarr dashboard to trusted internal users only, using network segmentation, firewalls, or VPNs. Implement strict egress filtering on the Homarr host or container to prevent unauthorized outbound HTTP requests to internal or sensitive IP ranges. Employ Web Application Firewalls (WAFs) with rules to detect and block SSRF patterns targeting internal IP addresses. Monitor logs for unusual outbound requests originating from the Homarr server. Additionally, review and harden internal services that could be targeted via SSRF, such as metadata services or admin interfaces, by enforcing authentication and access controls. Conduct regular vulnerability scanning and penetration testing to detect SSRF and other web application vulnerabilities. Finally, educate development teams on secure coding practices to validate and sanitize user-supplied URLs or inputs that trigger server-side requests.