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CVE-2026-22674

Hashgraph Guardian Stored XSS via branding companyName field

Hashgraph Guardian through 3.6.0, fixed in commit ba8c566, contains a stored cross-site scripting vulnerability that allows authenticated users with the STANDARD_REGISTRY role to inject malicious scripts by submitting a crafted companyName value via the branding configuration API endpoint. Attackers can exploit the unsanitized innerHTML assignment in the branding service to execute arbitrary JavaScript in the browser of every authenticated user on every page load.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Hashgraph Hedera
Products
Guardian Guardian
CVE-2026-45248

Hedera Guardian Authentication Bypass Information Disclosure

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.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Hashgraph Hedera
Products
Guardian Guardian
CVE-2026-39911

Hashgraph Guardian 3.5.1 Unsandboxed JavaScript Execution RCE

Hashgraph Guardian through version 3.5.1, fixed in commit 45fbe2f, contains an unsandboxed JavaScript execution vulnerability in the Custom Logic policy block worker that allows authenticated Standard Registry users to execute arbitrary code by passing user-supplied JavaScript expressions directly to the Node.js Function() constructor without isolation. Attackers can import native Node.js modules to read arbitrary files from the container filesystem, access process environment variables containing sensitive credentials such as RSA private keys, JWT signing keys, and API tokens, and forge valid authentication tokens for any user including administrators.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Hashgraph Hedera
Products
Guardian Guardian