CVE-2026-49336

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{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-49336", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-22T15:05:06.323889Z"}}}], "references": [{"url": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-22T15:03:44.585Z"}}], "cna": {"title": "@microsoft/kiota-http-fetchlibrary: Bearer token and Cookie leak across origin on redirect due to case-mismatched scrub in fetchRequestAdapter", "source": {"advisory": "GHSA-396q-4vc8-28x9", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 5.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW"}}], "affected": [{"vendor": "microsoft", "product": "kiota-typescript", "versions": [{"status": "affected", "version": ">= 1.0.0-preview.97, < 1.0.0-preview.102"}]}], "references": [{"url": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9", "name": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/microsoft/kiota-typescript/commit/09f8bd9b34d68bf412a9b78f6ca7e7961ef14974", "name": "https://github.com/microsoft/kiota-typescript/commit/09f8bd9b34d68bf412a9b78f6ca7e7961ef14974", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "@microsoft/kiota-http-fetchlibrary provides TypeScript libraries for Kiota-generated API clients. In versions 1.0.0-preview.97 through 1.0.0-preview.101, `@microsoft/kiota-http-fetchlibrary`'s `RedirectHandler` is documented as stripping `Authorization` and `Cookie` from cross-origin redirect targets, but the default `scrubSensitiveHeaders` callback in `RedirectHandlerOptions` uses case-sensitive property deletion (`delete headers.Authorization`, `delete headers.Cookie`) on a headers object that `FetchRequestAdapter.getRequestFromRequestInformation` has already lower-cased. The delete therefore targets keys that do not exist, the scrub is a no-op, and any Bearer token or Cookie attached by a kiota-generated SDK is forwarded to an attacker-controlled host across a 30x redirect. This is reachable in the default middleware chain (`MiddlewareFactory.getDefaultMiddlewares`) with no custom configuration, and applies to every kiota-generated TypeScript SDK that uses `BaseBearerTokenAuthenticationProvider` or any other authentication provider that sets the `Authorization` request header. Version 1.0.0-preview.102 patches the issue."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-178", "description": "CWE-178: Improper Handling of Case Sensitivity"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-200", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-19T18:19:03.222Z"}}}, "cveMetadata": {"cveId": "CVE-2026-49336", "state": "PUBLISHED", "dateUpdated": "2026-06-22T15:05:46.759Z", "dateReserved": "2026-05-29T14:35:45.902Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-06-19T18:19:03.222Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "kiota-typescript", "vendor": "microsoft", "versions": [{"status": "affected", "version": ">= 1.0.0-preview.97, < 1.0.0-preview.102"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "@microsoft/kiota-http-fetchlibrary provides TypeScript libraries for Kiota-generated API clients. In versions 1.0.0-preview.97 through 1.0.0-preview.101, `@microsoft/kiota-http-fetchlibrary`'s `RedirectHandler` is documented as stripping `Authorization` and `Cookie` from cross-origin redirect targets, but the default `scrubSensitiveHeaders` callback in `RedirectHandlerOptions` uses case-sensitive property deletion (`delete headers.Authorization`, `delete headers.Cookie`) on a headers object that `FetchRequestAdapter.getRequestFromRequestInformation` has already lower-cased. The delete therefore targets keys that do not exist, the scrub is a no-op, and any Bearer token or Cookie attached by a kiota-generated SDK is forwarded to an attacker-controlled host across a 30x redirect. This is reachable in the default middleware chain (`MiddlewareFactory.getDefaultMiddlewares`) with no custom configuration, and applies to every kiota-generated TypeScript SDK that uses `BaseBearerTokenAuthenticationProvider` or any other authentication provider that sets the `Authorization` request header. Version 1.0.0-preview.102 patches the issue."}, {"lang": "es", "value": "@microsoft/kiota-http-fetchlibrary proporciona bibliotecas TypeScript para clientes API generados por Kiota. En las versiones 1.0.0-preview.97 a 1.0.0-preview.101, el \u2019RedirectHandler\u2019 de \u2019@microsoft/kiota-http-fetchlibrary\u2019 est\u00e1 documentado como que elimina \u2019Authorization\u2019 y \u2019Cookie\u2019 de los destinos de redirecci\u00f3n de origen cruzado, pero la devoluci\u00f3n de llamada predeterminada \u2019scrubSensitiveHeaders\u2019 en \u2019RedirectHandlerOptions\u2019 utiliza la eliminaci\u00f3n de propiedades que distingue entre may\u00fasculas y min\u00fasculas (\u2019delete headers.Authorization\u2019, \u2019delete headers.Cookie\u2019) en un objeto de encabezados que \u2019FetchRequestAdapter.getRequestFromRequestInformation\u2019 ya ha convertido a min\u00fasculas. Por lo tanto, la eliminaci\u00f3n apunta a claves que no existen, la limpieza es una operaci\u00f3n nula, y cualquier token Bearer o cookie adjuntado por un SDK generado por Kiota se reenv\u00eda a un host controlado por el atacante a trav\u00e9s de una redirecci\u00f3n 30x. Esto es accesible en la cadena de middleware predeterminada (\u2019MiddlewareFactory.getDefaultMiddlewares\u2019) sin configuraci\u00f3n personalizada, y se aplica a cada SDK TypeScript generado por Kiota que utiliza \u2019BaseBearerTokenAuthenticationProvider\u2019 o cualquier otro proveedor de autenticaci\u00f3n que establece el encabezado de solicitud \u2019Authorization\u2019. La versi\u00f3n 1.0.0-preview.102 corrige el problema."}], "id": "CVE-2026-49336", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "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:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49336", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-22T15:05:06.323889Z", "version": "2.0.3"}}]}, "published": "2026-06-19T19:16:36.430", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/microsoft/kiota-typescript/commit/09f8bd9b34d68bf412a9b78f6ca7e7961ef14974"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-178"}, {"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0-preview.97,1.0.0-preview.102)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "kiota-typescript", "source": "cna", "vendor": "microsoft"}, "product": "kiota-typescript", "vendor": "microsoft"}], "created": "2026-06-19T19:30:05.704033+00:00", "updated": "2026-06-19T20:30:04.652864+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$kiota-typescript"]}