Server-Side Request Forgery in Huginn (CVE-2026-63769)

CVE-2026-63769 identifies a server-side request forgery (SSRF) vulnerability present in Huginn versions up to and including 2022.08.18. The flaw resides specifically within the fetch_url method of the ScenarioImport component. Authenticated users can exploit this vulnerability by submitting specially crafted URLs, which the Huginn application then processes to make arbitrary HTTP requests. This capability allows attackers to probe internal network services, conduct port enumeration by analyzing varied error responses, and potentially access sensitive cloud metadata endpoints (such as 169.254.169.254). Successful exploitation can lead to the retrieval of critical information like temporary credentials or API keys, posing a significant risk for internal network reconnaissance and broader system compromise. The vulnerability was published on July 20, 2026.

Attack Chain

1. An authenticated attacker gains access to the Huginn application.
2. The attacker identifies the vulnerable ScenarioImport feature and prepares a malicious URL payload containing an internal network IP address (e.g., http://192.168.1.10/admin) or a cloud metadata endpoint (e.g., http://169.254.169.254/latest/meta-data/iam/security-credentials/).
3. The crafted URL is submitted through the application's fetch_url method within ScenarioImport, which is intended for legitimate URL fetching but lacks proper validation for the target.
4. The Huginn server, due to the SSRF vulnerability (CVE-2026-63769), makes an outbound HTTP request to the attacker-specified internal IP address or domain.
5. The attacker analyzes the response from the Huginn application (e.g., HTTP status codes, content, or error messages) to determine the accessibility of internal services and to enumerate open ports on target systems.
6. By iteratively crafting URLs to cloud metadata endpoints, the attacker attempts to extract sensitive credentials, such as temporary API keys or role-based access tokens, which can then be used for further lateral movement or data exfiltration within the cloud environment.

Impact

Successful exploitation of CVE-2026-63769 allows authenticated attackers to perform extensive internal network reconnaissance, mapping network topology, and discovering active services. The primary risk is the ability to access cloud metadata endpoints, which are commonly used to provision instances with temporary credentials. Attackers can leverage this to steal sensitive cloud API keys or security tokens, enabling them to assume roles within the cloud environment and access or exfiltrate data, provision new resources, or disrupt existing services. The CVSS v3.1 score of 7.7 (High) reflects the high confidentiality impact.

Recommendation

• Patch Huginn to a version beyond 2022.08.18 immediately to remediate CVE-2026-63769.
• Deploy the Sigma rule "Detect Huginn SSRF Exploitation (CVE-2026-63769)" to your SIEM to monitor for exploitation attempts.
• Configure web server logging to capture cs-uri-query and cs-uri-stem to allow detection of malicious URL parameters.
• Implement strict network segmentation and egress filtering to prevent internal systems from making arbitrary outbound requests to private IP ranges and cloud metadata endpoints from applications like Huginn.