CVE-2026-49336

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Source
https://cve.org/CVERecord?id=CVE-2026-49336
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49336.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49336
Aliases
Related
Published
2026-06-19T18:19:03.222Z
Modified
2026-07-09T18:51:43.372447818Z
Severity
  • 5.5 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
@microsoft/kiota-http-fetchlibrary: Bearer token and Cookie leak across origin on redirect due to case-mismatched scrub in fetchRequestAdapter
Details

@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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49336.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-178",
        "CWE-200"
    ]
}
References

Affected packages

Git / github.com/microsoft/kiota-typescript

Affected ranges

Type
GIT
Repo
https://github.com/microsoft/kiota-typescript
Events
Introduced
9f0ab765293ae34191c1f5966dba20454e12a255
Fixed
8c1bb2a11fb1b6873d35129308580ce6da877a71
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "1.0.0-preview.97"
        },
        {
            "fixed": "1.0.0-preview.102"
        }
    ]
}

Affected versions

@microsoft/kiota-abstractions@1.*
@microsoft/kiota-abstractions@1.0.0-preview.100
@microsoft/kiota-abstractions@1.0.0-preview.101
@microsoft/kiota-abstractions@1.0.0-preview.97
@microsoft/kiota-abstractions@1.0.0-preview.98
@microsoft/kiota-abstractions@1.0.0-preview.99
@microsoft/kiota-authentication-azure@1.*
@microsoft/kiota-authentication-azure@1.0.0-preview.100
@microsoft/kiota-authentication-azure@1.0.0-preview.101
@microsoft/kiota-authentication-azure@1.0.0-preview.97
@microsoft/kiota-authentication-azure@1.0.0-preview.98
@microsoft/kiota-authentication-azure@1.0.0-preview.99
@microsoft/kiota-authentication-spfx@1.*
@microsoft/kiota-authentication-spfx@1.0.0-preview.100
@microsoft/kiota-authentication-spfx@1.0.0-preview.101
@microsoft/kiota-authentication-spfx@1.0.0-preview.97
@microsoft/kiota-authentication-spfx@1.0.0-preview.98
@microsoft/kiota-authentication-spfx@1.0.0-preview.99
@microsoft/kiota-bundle@1.*
@microsoft/kiota-bundle@1.0.0-preview.100
@microsoft/kiota-bundle@1.0.0-preview.101
@microsoft/kiota-bundle@1.0.0-preview.97
@microsoft/kiota-bundle@1.0.0-preview.98
@microsoft/kiota-bundle@1.0.0-preview.99
@microsoft/kiota-http-fetchlibrary@1.*
@microsoft/kiota-http-fetchlibrary@1.0.0-preview.100
@microsoft/kiota-http-fetchlibrary@1.0.0-preview.101
@microsoft/kiota-http-fetchlibrary@1.0.0-preview.97
@microsoft/kiota-http-fetchlibrary@1.0.0-preview.98
@microsoft/kiota-http-fetchlibrary@1.0.0-preview.99
@microsoft/kiota-serialization-form@1.*
@microsoft/kiota-serialization-form@1.0.0-preview.100
@microsoft/kiota-serialization-form@1.0.0-preview.101
@microsoft/kiota-serialization-form@1.0.0-preview.97
@microsoft/kiota-serialization-form@1.0.0-preview.98
@microsoft/kiota-serialization-form@1.0.0-preview.99
@microsoft/kiota-serialization-json@1.*
@microsoft/kiota-serialization-json@1.0.0-preview.100
@microsoft/kiota-serialization-json@1.0.0-preview.101
@microsoft/kiota-serialization-json@1.0.0-preview.97
@microsoft/kiota-serialization-json@1.0.0-preview.98
@microsoft/kiota-serialization-json@1.0.0-preview.99
@microsoft/kiota-serialization-multipart@1.*
@microsoft/kiota-serialization-multipart@1.0.0-preview.100
@microsoft/kiota-serialization-multipart@1.0.0-preview.101
@microsoft/kiota-serialization-multipart@1.0.0-preview.97
@microsoft/kiota-serialization-multipart@1.0.0-preview.98
@microsoft/kiota-serialization-multipart@1.0.0-preview.99
@microsoft/kiota-serialization-text@1.*
@microsoft/kiota-serialization-text@1.0.0-preview.100
@microsoft/kiota-serialization-text@1.0.0-preview.101
@microsoft/kiota-serialization-text@1.0.0-preview.97
@microsoft/kiota-serialization-text@1.0.0-preview.98
@microsoft/kiota-serialization-text@1.0.0-preview.99

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49336.json"