Auth bypass in Laravel Passport
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 (si…
Vulnerability class: Broken Authentication
EPSS: 0.001 (29.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N.
Affected products
- Laravel Passport — versions >= 13.0.0, < 13.7.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Exploit, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2026-39976?
- CVE-2026-39976 is a high-severity vulnerability in Laravel Passport, classified under Improper Authentication. CVSS score: 7.1/10. Published 2026-04-09.
- How severe is CVE-2026-39976?
- High severity. CVSS v3 base score is 7.1 out of 10.