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TI-2026-28832 Aliases CVE-2026-39976GHSA-349c-2h2f-mxf6

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

Priority LOW 31CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00294 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed passport (laravel): 13.7.1laravel/passport (Packagist): 13.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Laravelpassport13.0.0 to before 13.7.113.7.1Patch availableCNA
—laravel/passport (Packagist)13.0.0 to before 13.7.113.7.1Patch availableGHSA-349c-2h2f-mxf6
  • passport VendorLaravel Affected 13.0.0 to before 13.7.1 Fixed in 13.7.1 Patch available CNA
  • laravel/passport (Packagist) Vendor— Affected 13.0.0 to before 13.7.1 Fixed in 13.7.1 Patch available GHSA-349c-2h2f-mxf6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:laravel:passport:*:*:*:*:*:laravel:*:*13.0.0 to before 13.7.1VulnerableLaravel
  • cpe:2.3:a:laravel:passport:*:*:*:*:*:laravel:*:* Versions 13.0.0 to before 13.7.1 Vulnerable ·Laravel

Remediation

  • Fix · CNA passport (laravel) Fixed in 13.7.1
  • Fix · GHSA-349c-2h2f-mxf6 laravel/passport (Packagist) Fixed in 13.7.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39976
  2. 2026-10-03 Alias added: GHSA-349c-2h2f-mxf6

References

Exploit 1

Patch 3

Advisory 2

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences