{"id":"CVE-2026-58399","sourceIdentifier":"security-advisories@github.com","published":"2026-07-01T15:17:11.377","lastModified":"2026-10-25T17:10:00.197","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"@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."},{"lang":"es","value":"@acastellon/auth es un sistema de control de autenticación para microservicios. Las versiones anteriores a la 2.3.0 parecen permitir una omisión de autenticación no autenticada en validateToken() a través de encabezados de solicitud auth-user y Host falsificables. El middleware validateToken contiene una omisión de servicio a servicio para auth-user: service-brother cuando req.get(’host’).startsWith(getHostName()). Ambos valores involucrados en la verificación pueden ser influenciados por un cliente HTTP no autenticado: auth-user es un encabezado de solicitud, y Host también es controlado por el cliente. Como resultado, un atacante remoto no autenticado puede enviar una solicitud con encabezados manipulados y omitir la validación del token antes de que se ejecute la lógica de validación normal de legacy/JWT/OIDC. Se ha implementado una solución en la v2.3.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"antonio-castellon","product":"module-auth","versions":[{"version":"< 2.3.0","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-02T14:25:47.187429Z","id":"CVE-2026-58399","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-287"}]}],"references":[{"url":"https://github.com/antonio-castellon/module-auth/issues/6","source":"security-advisories@github.com"},{"url":"https://github.com/antonio-castellon/module-auth/security/advisories/GHSA-gfj5-979r-92pw","source":"security-advisories@github.com"},{"url":"https://www.npmjs.com/package/@acastellon/auth/v/2.3.0","source":"security-advisories@github.com"}]}