Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens

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Summary

CVECVE-2026-39976
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 17:16:31 UTC
Updated2026-04-09 17:16:31 UTC
DescriptionLaravel Passport provides OAuth2 server support to Laravel. From 13.0.0 to before 13.7.1, there is an Authentication Bypass for client_credentials tokens. the league/oauth2-server library sets the JWT sub claim to the client identifier (since there's no user). The token guard then passes this value to retrieveById() without validating it's actually a user identifier, potentially resolving an unrelated real user. Any machine-to-machine token can inadvertently authenticate as an actual user. This vulnerability is fixed in 13.7.1.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Laravel Passport affected >= 13.0.0, < 13.7.1 Not specified

References

ReferenceSourceLinkTags
github.com/thephpleague/oauth2-server/issues/1456 [email protected] github.com
github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6 [email protected] github.com
github.com/laravel/passport/pull/1902 [email protected] github.com
github.com/laravel/passport/pull/1901 [email protected] github.com
github.com/laravel/passport/issues/1900 [email protected] github.com
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