Vulnerability Report

CVE-2026-39976

Title: Authentication Bypass in Laravel Passport

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-39976.

CWE Category CWE-287

Published Date Apr 09, 2026

Modified Date Jun 02, 2026

Exploit Status Not Found

Score 7.1 CVSS v3.1

Exploit Probability (EPSS)

0.11%

Vulnerability Summary

CVE-2026-39976: 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.

Impacted Vendors

envoy 1

laravel 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.1

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-39976 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 02, 2026 MODIFIED

Vulnerability data updated via NVD.

April 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 09, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.