Auth bypass in Hashgraph Guardian
CVE-2026-45248
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
- Hashgraph Guardian — versions 0
- Hedera Guardian
Weakness classification (CWE)
References
- github.com/hashgraph/guardian/pull/6076 (issue-tracking, Patch, Issue Tracking)
- www.vulncheck.com/advisories/hedera-guardian-authentication-bypass-information-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-45248?
- CVE-2026-45248 is a medium-severity vulnerability in Hashgraph Guardian, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-05-14.
- How severe is CVE-2026-45248?
- Medium severity. CVSS v3 base score is 5.3 out of 10.