CVE-2026-70620 in Odysseus
Summary
by MITRE • 08/05/2026
Odysseus before commit 87babb5 contains a server-side request forgery vulnerability that allows admin-privileged attackers to direct the server to probe internal network resources by supplying arbitrary URLs to the embedding endpoint configuration without scheme, host, IP range, or DNS rebind validation. Attackers can submit loopback addresses, RFC 1918 ranges, or link-local addresses through the embedding endpoint API to partially read responses from cloud instance metadata services, internal APIs, and other hosts reachable from the server.
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Analysis
by VulDB Data Team • 08/05/2026
This vulnerability represents a critical server-side request forgery flaw in the Odysseus application that fundamentally undermines network security boundaries. The issue stems from inadequate input validation within the embedding endpoint configuration functionality, where the system fails to properly sanitize or restrict URL parameters submitted by authenticated administrators. This weakness creates an attack vector that allows privilege escalation from administrative access to internal network reconnaissance capabilities.
The technical implementation flaw resides in the absence of proper scheme validation, host restriction mechanisms, and IP range filtering within the URL parsing logic. When administrators submit URLs to the embedding endpoint without specifying a scheme, the system processes these inputs without adequate safeguards against loopback addresses such as 127.0.0.1 or ::1, RFC 1918 private address ranges like 10.x.x.x or 192.168.x.x, or link-local addresses such as 169.254.x.x. This lack of validation creates a direct pathway for attackers to probe internal network resources that should remain isolated from external access.
From an operational impact perspective, this vulnerability enables attackers to perform extensive reconnaissance of internal systems by leveraging cloud instance metadata services such as AWS EC2 metadata endpoints, internal API servers, and other network services reachable from the vulnerable server. The attack surface expands significantly as threat actors can potentially extract sensitive information including IAM credentials, system configuration details, and internal service endpoints that would normally be protected by network segmentation policies. This reconnaissance capability provides attackers with valuable intelligence for subsequent exploitation phases within the internal network environment.
The vulnerability aligns with CWE-918 Server-Side Request Forgery and maps to ATT&CK technique T1046 Network Service Scanning, where adversaries scan internal network resources to identify accessible services and potential attack vectors. This type of vulnerability commonly appears in applications that fail to implement proper input sanitization and access control measures for external resource loading features. Organizations should immediately implement strict URL validation rules that reject loopback addresses, private IP ranges, and link-local addresses while also enforcing proper network segmentation controls to limit the impact of such vulnerabilities.
Mitigation strategies include implementing comprehensive URL validation at the application level with explicit whitelisting of allowed schemes and domains, deploying network-level restrictions that prevent outbound connections to internal address ranges, and establishing proper authentication and authorization controls to limit access to embedding endpoints. Additionally, organizations should consider implementing DNS rebinding protection mechanisms, logging all external resource requests for monitoring purposes, and conducting regular security assessments of embedded resource handling functionality to identify similar vulnerabilities across their application portfolio.