CVE-2026-27193

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{"affected": [{"affectedData": [{"product": "feathers", "vendor": "feathersjs", "versions": [{"status": "affected", "version": "< 5.0.40"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:feathersjs:feathers:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "5396E6E0-0D34-409C-A8A6-57AF06A90FEE", "versionEndExcluding": "5.0.40", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In versions 5.0.39 and below, all HTTP request headers are stored in the session cookie, which is signed but not encrypted, exposing internal proxy/gateway headers to clients. The OAuth service stores the complete headers object in the session, then the session is persisted using cookie-session, which base64-encodes the data. While the cookie is signed to prevent tampering, the contents are readable by anyone by simply decoding the base64 value. Under specific deployment configurations (e.g., behind reverse proxies or API gateways), this can lead to exposure of sensitive internal infrastructure details such as API keys, service tokens, and internal IP addresses. This issue has been fixed in version 5.0.40."}, {"lang": "es", "value": "Feathersjs es un framework para crear API web y aplicaciones en tiempo real con TypeScript o JavaScript. En las versiones 5.0.39 e inferiores, todos los encabezados de solicitud HTTP se almacenan en la cookie de sesi\u00f3n, la cual est\u00e1 firmada pero no cifrada, exponiendo los encabezados internos de proxy/gateway a los clientes. El servicio OAuth almacena el objeto completo de encabezados en la sesi\u00f3n, luego la sesi\u00f3n se persiste utilizando cookie-session, que codifica los datos en base64. Aunque la cookie est\u00e1 firmada para evitar la manipulaci\u00f3n, el contenido es legible por cualquiera simplemente decodificando el valor base64. Bajo configuraciones de despliegue espec\u00edficas (por ejemplo, detr\u00e1s de proxies inversos o gateways de API), esto puede llevar a la exposici\u00f3n de detalles sensibles de la infraestructura interna, como claves de API, tokens de servicio y direcciones IP internas. Este problema ha sido solucionado en la versi\u00f3n 5.0.40."}], "id": "CVE-2026-27193", "lastModified": "2026-06-17T10:26:49.503", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27193", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-25T21:24:07.337562Z", "version": "2.0.3"}}]}, "published": "2026-02-21T05:17:28.827", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-9m9c-vpv5-9g85"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.0.40)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "feathers", "source": "cna", "vendor": "feathersjs"}, "product": "feathers", "vendor": "feathersjs"}], "analysis": {"en": {"generated_at": "2026-04-18T11:21:14.445455+00:00", "value": {"mitigation_remediation": ["Upgrade the Feathersjs framework to version 5.0.40 or later to eliminate the storage of raw headers in the session cookie.", "Configure session handling to encrypt cookie payloads or, if encryption is unavailable, remove sensitive headers from the session before persistence.", "If upgrading immediately is not possible, restrict the visibility of internal headers on the reverse proxy or API gateway, and consider moving session storage to a server\u2011side store that does not expose header data to clients."], "summary": {"action": "Patch", "impact": "Information Disclosure"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the Feathersjs framework, particularly node.js applications using feathers version 5.0.39 or earlier. Deployments that pass through reverse proxies or API gateways may inadvertently expose additional internal details through the unencrypted session data.", "description_and_impact": "Feathersjs version 5.0.39 and earlier store every HTTP request header in the session cookie. The cookie is signed but not encrypted; base64 decoding exposes the entire headers object, including internal proxy, gateway, and OAuth service headers. The leaked data may contain sensitive API keys, service tokens, or internal IP addresses, thereby compromising confidentiality. This flaw is categorized as a data confidentiality weakness.", "risk_and_exploitability": "The CVSS score is 8.2, indicating a high severity. The EPSS score is below 1% and the vulnerability is not listed in CISA\u2019s KEV catalog, suggesting a low current exploitation probability. Based on the description, an attacker who can obtain a client\u2019s session cookie\u2014whether through browser interception, cross\u2011site request forgery, or other client\u2011side attacks\u2014is inferred to be able to decode it and read the exposed headers. Based on the description, the lack of encryption and the fact that the cookie is only signed is inferred to make the attack vector straightforward for remote attackers with access to the client or network traffic."}}}}, "created": "2026-02-23T14:32:51.306002+00:00", "updated": "2026-04-18T11:30:44.312528+00:00", "vendors": ["feathersjs", "feathersjs$PRODUCT$feathers"]}