CVE-2026-27797: Homarr Dashboard SSRF Vulnerability

CVE-2026-27797 Overview

CVE-2026-27797 is an unauthenticated Server-Side Request Forgery (SSRF) vulnerability in Homarr, an open-source dashboard application. Prior to version 1.54.0, this vulnerability allows a remote attacker to force the Homarr server to perform arbitrary outbound HTTP requests without authentication. This can be exploited as an internal network access primitive, enabling attackers to reach loopback interfaces and private network ranges from the Homarr host or container network context.

Critical Impact

Unauthenticated attackers can leverage the Homarr server to access internal network resources, potentially exposing sensitive services and data that should not be accessible from external networks.

Affected Products

• Homarr versions prior to 1.54.0

Discovery Timeline

• 2026-03-07 - CVE-2026-27797 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-27797

Vulnerability Analysis

This Server-Side Request Forgery (SSRF) vulnerability (CWE-918) exists in Homarr's request handling functionality. The application fails to properly validate or restrict URLs provided by users before making server-side HTTP requests. Because the vulnerability is unauthenticated, any remote attacker with network access to the Homarr instance can exploit this flaw without providing credentials.

The SSRF vulnerability allows attackers to abuse the trust relationship between the Homarr server and internal network resources. When exploited, the server acts as a proxy, making requests on behalf of the attacker to destinations that would otherwise be unreachable from external networks. This includes localhost services (127.0.0.1), private IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), and cloud metadata endpoints.

Root Cause

The root cause of this vulnerability is insufficient input validation and URL scheme/host restrictions in Homarr's HTTP request handling logic. The application does not implement proper allowlisting or blocklisting mechanisms to prevent requests to internal network addresses, loopback interfaces, or other sensitive destinations. This lack of validation allows user-controlled input to directly influence the destination of server-side HTTP requests.

Attack Vector

The attack vector is network-based and requires no authentication. An attacker can craft malicious requests to the Homarr server, supplying URLs that point to internal resources. The Homarr server then processes these requests, effectively acting as an intermediary to access internal services. This could be used to:

• Scan internal network services and ports
• Access cloud provider metadata services (e.g., AWS IMDSv1 at 169.254.169.254)
• Interact with internal APIs and services
• Exfiltrate sensitive information from internal resources
• Bypass network segmentation and firewall rules

The vulnerability manifests in the application's URL handling functionality where user-supplied URLs are not properly validated before initiating server-side requests. For technical implementation details, refer to the GitHub Security Advisory GHSA-vwqf-2f4m-2cq2 and the patch commit.

Detection Methods for CVE-2026-27797

Indicators of Compromise

• Unusual outbound HTTP requests from the Homarr server to internal IP ranges (127.0.0.1, 10.x.x.x, 172.16.x.x, 192.168.x.x)
• Requests to cloud metadata endpoints (169.254.169.254) originating from the Homarr container or host
• High volume of outbound requests to various internal ports indicating reconnaissance activity
• Access logs showing requests with URLs containing internal hostnames or private IP addresses

Detection Strategies

• Monitor Homarr server egress traffic for connections to internal network ranges and localhost
• Implement network-level monitoring to detect SSRF patterns such as requests to metadata services or internal APIs
• Review Homarr application logs for suspicious URL parameters that reference internal resources
• Deploy web application firewall (WAF) rules to detect and block SSRF payload patterns

Monitoring Recommendations

• Enable detailed logging for all outbound HTTP requests made by the Homarr application
• Configure network monitoring to alert on unexpected internal connections from the Homarr host
• Implement DNS monitoring to detect resolution of internal hostnames from the Homarr server
• Set up alerts for access to sensitive internal services from the Homarr network context

How to Mitigate CVE-2026-27797

Immediate Actions Required

• Upgrade Homarr to version 1.54.0 or later immediately
• If immediate upgrade is not possible, restrict network access to the Homarr instance using firewall rules
• Implement network segmentation to limit the Homarr server's ability to reach sensitive internal services
• Review logs for evidence of prior exploitation attempts

Patch Information

Homarr has addressed this vulnerability in version 1.54.0. The fix implements proper URL validation to prevent SSRF attacks. The patch can be reviewed at the GitHub commit fce970c70653f200ff1c73081139a77f0379bd91. Users should upgrade to the latest version available from the GitHub Release v1.54.0.

Workarounds

• Place the Homarr instance behind a reverse proxy with URL filtering capabilities to block requests containing internal IP addresses
• Implement network-level egress filtering to prevent the Homarr container/host from accessing internal services
• Use firewall rules to restrict outbound connections from the Homarr server to only necessary external destinations
• Deploy Homarr in an isolated network segment with limited access to internal resources

# Example: Docker network isolation for Homarr
# Create an isolated network with restricted access
docker network create --internal homarr-isolated

# Run Homarr with restricted network egress
docker run -d \
  --name homarr \
  --network homarr-isolated \
  -p 7575:7575 \
  ghcr.io/homarr-labs/homarr:1.54.0