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CVE-2026-92808 – Unauthenticated SSRF Leading to Full Compromise – Altium Enterprise Server (Unified

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Summary

CVE-2026-92808 is a critical Server-Side Request Forgery (SSRF) vulnerability in the UnifiedLogin single sign-on service of Altium Enterprise Server. An unauthenticated network attacker can force the server to issue outbound HTTP requests to a destination of the attacker’s choosing, including internal services that are reachable only from the server itself. Exploitation can lead to credential theft, administrative session hijacking, and complete compromise of the on-premise Enterprise Server; Altium 365 cloud deployments are not affected.

Technical details

  • Root cause: The UnifiedLogin service (the on-prem Enterprise Server’s SSO endpoint) accepts attacker-controlled input that is used to construct outbound HTTP requests without adequate validation or restriction of the destination, combined with missing authentication checks on the affected function (CWE-918: SSRF, CWE-306: Missing Authentication for Critical Function).
  • Trigger conditions: No authentication or user interaction is required — a network attacker simply sends a crafted request to the UnifiedLogin endpoint.
  • Attack vector: Network (remote, unauthenticated). Privileges required: none. User interaction: none.
  • Impact: The forged requests can reach internal-only services (e.g., internal APIs or credential stores) that trust requests originating from the server itself, enabling retrieval of stored credentials and hijacking of administrative sessions, which can result in full compromise of the Enterprise Server deployment.
  • Deployment scope: Only on-premise Altium Enterprise Server installations are affected; Altium 365 cloud deployments are explicitly stated as unaffected.

Affected software

  • Altium Enterprise Server (on-premise) — all versions prior to 8.1.1
  • Component: UnifiedLogin Service (SSO endpoint)
  • Altium 365 (cloud) — not affected

Severity

  • CVSS v4.0 Base Score: 10.0 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • Attack Vector: Network, Attack Complexity: Low, Privileges Required: None, User Interaction: None; full impact to confidentiality, integrity, and availability of both the vulnerable system and downstream (subsequent) systems.

Mitigation and recommended actions

  • Immediate: Upgrade all on-premise Altium Enterprise Server installations to version 8.1.1 or later, which remediates this issue.
  • If immediate patching is not possible:
    • Restrict network access to the UnifiedLogin/SSO endpoint so it is reachable only from trusted management networks, not the open internet.
    • Segment the Enterprise Server host from internal-only services and credential stores it should not be able to reach, to limit the blast radius of any forged outbound requests.
    • Monitor outbound HTTP traffic originating from the Enterprise Server host for connections to unexpected internal or external destinations.
    • Rotate credentials that may be reachable via internal services accessible from the Enterprise Server host as a precaution until patched.

References

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