{"id":"EUVD-2026-41013","revision":null,"records":[{"revision":"167c7352cd004f79ad8c35f8540ea438","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-58399","aliases":[],"title":"@acastellon/auth has an authentication bypass via spoofable headers in validateToken()","description":"@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. 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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.\n\nImpact:\nAn attacker may be able to access routes protected by validateToken() without a valid token. In deployments where downstream services trust auth-user or is-* headers, this may also lead to privilege escalation.\n\nAffected package:\n@acastellon/auth v2.2.0\n\nAffected code:\nauth.js, validateToken()\nThe issue is related to the service-brother bypass and getHostName() check.\n\nExample request:\n```\nGET /protected HTTP/1.1\nHost: <configured CNAME or hostname>\nauth-user: service-brother\nis-admin: true\n```\n\nExpected behavior:\nThe request should require a valid authentication token.\n\nActual behavior:\nThe middleware calls next() before token validation.\n\nFix implemented in v2.3.0+:\n\nRemoved the spoofable bypass.\nAlways sanitize incoming auth-user and is-* headers.\nAdded mTLS client certificate based service auth (with optional TRUSTED_MTLS_SERVICES allowlist).\nUpdated consumers (rest, graphql, dns-client) for mTLS support.\nUnit tests added for sanitization + mTLS path.","state":0,"publishedAt":"2026-06-18T17:22:47+00:00","modifiedAt":"2026-09-10T03:51:08.6614301+00:00","affected":[{"ecosystem":"npm","name":"@acastellon/auth","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.3.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/antonio-castellon/module-auth/security/advisories/GHSA-gfj5-979r-92pw","https://github.com/antonio-castellon/module-auth/issues/6","https://github.com/antonio-castellon/module-auth","https://www.npmjs.com/package/@acastellon/auth/v/2.3.0"],"sourceUrl":"https://github.com/advisories/GHSA-gfj5-979r-92pw","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-gfj5-979r-92pw","identifiers":["GHSA-gfj5-979r-92pw","CVE-2026-58399"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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