CVE-2026-92808: Altium Enterprise Server SSRF Vulnerability

CVE-2026-92808 Overview

CVE-2026-92808 is a server-side request forgery (SSRF) vulnerability in the UnifiedLogin service of Altium Enterprise Server. An unauthenticated network attacker can force the server to issue outbound HTTP requests to arbitrary destinations, including internal services that are only reachable from the server itself.

One such internal service exposes server configuration and credential material without authentication, relying only on the request originating locally. Because forged requests originate from the server process, the local-origin check is satisfied. An attacker can retrieve stored credentials, obtain an administrative session, and fully compromise the server and its services. Altium 365 cloud deployments are not affected because the vulnerable endpoint is disabled in cloud mode.

Critical Impact
Unauthenticated attackers can extract stored credentials through the SSRF, escalate to administrator, and take full control of Altium Enterprise Server on-premises deployments.

Affected Products

Altium Enterprise Server (on-premises deployments running the UnifiedLogin service)
Altium NEXUS Server variants that embed the same UnifiedLogin component
Altium 365 cloud deployments are NOT affected — the vulnerable endpoint is disabled in cloud mode

Discovery Timeline

2026-09-16 - CVE-2026-92808 published to the National Vulnerability Database
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-92808

Vulnerability Analysis

The vulnerability is a classic SSRF chained with a missing authentication check on an internal management endpoint [CWE-306]. The UnifiedLogin service accepts an attacker-controlled URL and dispatches an HTTP request to it from the server process. Because the request originates on the loopback interface, it satisfies the trust boundary used by an adjacent internal service.

That internal service returns configuration data and stored credential material to any caller it perceives as local. By pivoting the SSRF against this endpoint, an unauthenticated remote attacker can retrieve credentials, replay them against the administrative interface, and establish an authenticated administrative session. From that session, an attacker controls all services hosted by the Altium Enterprise Server, including project data, PCB designs, and integrated identity components.

Root Cause

The root cause is two-fold. First, the UnifiedLogin service performs outbound HTTP requests using attacker-supplied destinations without enforcing an allow-list or blocking loopback and internal network ranges. Second, the internal configuration and credentials endpoint enforces authorization based solely on request origin, treating any locally-sourced request as trusted. Neither control alone is sufficient, and their combination produces an unauthenticated pre-auth compromise path.

Attack Vector

Exploitation requires only network reachability to the Altium Enterprise Server's HTTP interface. An attacker submits a crafted request to the UnifiedLogin service specifying an internal target URL — for example, the local configuration endpoint that returns credential material. The server dutifully issues the request on the attacker's behalf and returns the response, exposing credentials. The attacker then authenticates against the administrative interface using those credentials and takes full control. No user interaction, prior authentication, or elevated privileges are required. See the Altium Security Advisory Page for vendor technical details.

Detection Methods for CVE-2026-92808

Indicators of Compromise

Outbound HTTP requests initiated by the UnifiedLogin service process targeting 127.0.0.1, localhost, or internal RFC1918 addresses that do not match legitimate integration destinations.
Access log entries on the internal configuration or credentials endpoint that were not triggered by an administrator workflow.
New or unexpected administrative sessions in Altium Enterprise Server audit logs originating from external IP addresses.
Credential reuse indicators — service account authentications from unusual source hosts shortly after suspicious UnifiedLogin activity.

Detection Strategies

Inspect UnifiedLogin request logs for URL parameters or JSON bodies containing loopback, private-range, or metadata service URLs.
Correlate SSRF-shaped requests with subsequent administrative logins that occur within a short time window from the same or related source.
Monitor for anomalous process behavior in which the Altium Enterprise Server process opens TCP sessions to internal-only ports it does not normally contact.

Monitoring Recommendations

Forward Altium Enterprise Server web and application logs to a centralized SIEM with retention sufficient for retrospective hunting.
Alert on any request to the internal credentials endpoint that does not originate from an approved administrative workflow.
Baseline outbound HTTP destinations from the UnifiedLogin service and alert on deviations.

How to Mitigate CVE-2026-92808

Immediate Actions Required

Apply the vendor-supplied patch referenced on the Altium Security Advisory Page as soon as it is available for your deployment.
Restrict network exposure of the Altium Enterprise Server management interface to trusted administrative networks only, using firewall or reverse-proxy allow-lists.
Rotate all credentials stored in or accessible to the Altium Enterprise Server, including integration and service accounts, on the assumption they may have been exposed.
Review administrative session logs and audit trails for unauthorized access predating the patch.

Patch Information

Altium has published guidance on the Altium Security Advisory Page. Administrators should consult the advisory for fixed version numbers applicable to their Altium Enterprise Server or Altium NEXUS Server deployment and apply updates through the standard vendor upgrade path. Altium 365 cloud tenants require no action because the vulnerable endpoint is disabled in cloud mode.

Workarounds

Block network access to the UnifiedLogin service from untrusted networks at the perimeter or reverse-proxy layer until the patch is applied.
Disable the UnifiedLogin service if it is not required by your integration topology and users can authenticate through alternative flows.
Enforce egress filtering on the server host to prevent the Altium Enterprise Server process from initiating connections to loopback or internal-only management endpoints.

bash

# Example egress restriction using iptables to block the Altium server
# process from reaching loopback management ports (adjust UID and ports)
sudo iptables -A OUTPUT -m owner --uid-owner altium \
  -d 127.0.0.0/8 -p tcp --dport 8080 -j REJECT
sudo iptables -A OUTPUT -m owner --uid-owner altium \
  -d 127.0.0.0/8 -p tcp --dport 9000 -j REJECT