OAuthLib: Bearer token can be retrieved as long as client knows a valid client ID for device workflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-49272
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 21:18:50 UTC
Updated2026-11-05 22:18:44 UTC
DescriptionOAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.3.0 until 4.0.1, OAuthLib's RFC 8628 device workflow does not require DeviceCodeGrant.validate_token_request to check that the device_code parameter is present and valid. A caller whose client request is accepted by the configured validator and who knows a valid client ID enabled for the device workflow can submit a missing or bogus device code to the token endpoint and obtain a bearer token without completing device authorization. This issue is fixed in version 4.0.1.

Risk And Classification

Primary CVSS: v3.1 8.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

EPSS: 0.003280000 probability, percentile 0.260220000 (date 2026-11-06)

Problem Types: CWE-287 | CWE-287 CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.5HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
3.1CNADECLARED8.5HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Oauthlib Oauthlib affected >= 3.3.0, < 4.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/oauthlib/oauthlib/security/advisories/GHSA-3jp2-3mrg-2vxc 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/oauthlib/oauthlib/commit/77a5f1c8ce00da2b0b8c5f6e9cc129920085... [email protected] github.com
github.com/oauthlib/oauthlib/pull/954 [email protected] github.com
github.com/oauthlib/oauthlib/releases/tag/v4.0.1 [email protected] github.com
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