CVE-2026-67436 in the redfish-* monitoring plugins is not a classic server-side request forgery. It is a trust inversion: the plugin carries authentication credentials (X-Auth-Token or HTTP Basic) to whatever destination an authenticated BMC response tells it to visit next.
Redfish APIs use HATEOAS-style navigation — responses include @odata.id links that point to subsequent resources. The plugin follows these links as intended by the specification. But when the BMC is compromised, it can substitute a malicious URL into what the plugin perceives as normal navigation. The plugin then sends its valid credentials to that attacker-controlled destination, enabling exfiltration.
What makes this distinct from SSRF: in traditional SSRF, the attacker controls a URL parameter directly. Here, the attacker controls the response from an already-authenticated endpoint, and the plugin voluntarily carries those credentials to wherever the response directs it. The attack surface is the authenticated channel itself, not an unauthenticated parameter.
Check your deployment: identify any redfish-* plugins in your monitoring stack. Verify whether they automatically follow @odata.id redirects from BMC responses while carrying credentials. If they do, treat the current configuration as exploitable — a compromised or malicious BMC can capture those credentials.
Remediation options: implement destination allowlisting so the plugin only follows redirects to explicitly approved hostnames or IP ranges before carrying credentials. Alternatively, redesign the plugin to fetch specific resource URLs directly rather than navigating through response-provided links — fetch the /Systems endpoint by absolute path rather than following a link from /redfish/v1. The key is treating response-supplied URLs as untrusted input, not safe navigation.
The impact extends beyond credential theft. Redfish credentials typically map to accounts with IPMI privileges, SOL access, and sometimes host-level BMC commands. Compromising these credentials doesn't give you one server — it gives you a pivot into the out-of-band management fabric, potentially affecting hundreds of systems on that management network. Prioritize remediation based on this horizontal blast radius.