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Vulnerability record · CVE-2026-39976 · published 9 April 2026

CVE-2026-39976: Laravel passport improper authentication vulnerability

Laravel · Passport

Laravel 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.

7.1 CVSS 3.1 High EPSS 0.40% · top 68.9% CWE-287 · Improper authentication
7.1CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

Laravel 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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/laravel/passport/issues/1900 ExploitIssue Tracking
https://github.com/laravel/passport/pull/1901 Issue TrackingPatch
https://github.com/laravel/passport/pull/1902 Issue TrackingPatch
https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6 MitigationVendor Advisory
https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996 Issue TrackingPatch

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-39976), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.