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CVE-2026-39976

CVE-2026-39976 · Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 7.1 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • passport

    Versions
    • >= 13.0.0, < 13.7.1: Affected

    No fix published

  • laravel/passport Packagist

    Versions
    • v13.0.0
    • v13.0.1
    • v13.0.2
    • v13.0.3
    • v13.0.4
    • v13.0.5
    • v13.0.6
    • v13.1.0
    • v13.2.0
    • v13.2.1
    • v13.2.2
    • v13.3.0
    • v13.4.0
    • v13.4.1
    • v13.4.2
    • v13.4.3
    • v13.4.4
    • v13.5.0
    • v13.6.0
    • v13.7.0
    Affected ranges
    • ECOSYSTEM: ≥ 13.0.0, < 13.7.1

    Update to 13.7.1

Original sources

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