CVE-2026-45248: Hedera Guardian

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Hedera Guardian through 3.5.1 contains an authentication bypass vulnerability in the GET /api/v1/demo/registered-users endpoint that allows unauthenticated attackers to retrieve sensitive user information. Attackers can access the endpoint without providing authentication credentials to obtain usernames, Hedera DIDs, parent registry DIDs, system roles, and policy role assignments for all registered users in the system.

Affected products

• Hedera Guardian: up to and including 3.5.1

Published 2026-05-14. Last modified 2026-07-14.