@acastellon/auth is an authentication control system for microservices. Versions prior to 2.3.0 appear to allow an unauthenticated authentication bypass in validateToken() through spoofable auth-user and Host request headers. The validateTo…
Exact source revision recorded 5 Nov 2026 12:40:44 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-41013
Published@acastellon/auth is an authentication control system for microservices. Versions prior to 2.3.0 appear to allow an unauthenticated authentication bypass in validateToken() through spoofable auth-user and Host request headers. The validateToken middleware contains a service-to-service bypass for auth-user: service-brother when req.get('host').startsWith(getHostName()). Both values involved in the check can be influenced by an unauthenticated HTTP client: auth-user is a request header, and Host is also client-controlled. As a result, a remote unauthenticated attacker can send a request with crafted headers and bypass token validation before the normal legacy/JWT/OIDC validation logic runs. A fix has been implemented in v2.3.0.
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Original publisher date fields
datePublished: Jul 1, 2026, 2:25:44 PM
dateUpdated: Jul 2, 2026, 2:26:00 PM
- Source published
- Jul 1, 2026, 2:25:44 PM (timezone not stated)
- Source modified
- Jul 2, 2026, 2:26:00 PM (timezone not stated)
- Observed here
- 5 Nov 2026 12:40:44 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 4.0 · 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N