CVE-2026-39976
PHP vulnerability analysis and mitigation

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.


SourceNVD

Related PHP vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-39394HIGH8.1
  • PHPPHP
  • ci4-cms-erp/ci4ms
NoYesApr 08, 2026
CVE-2026-39393HIGH8.1
  • PHPPHP
  • ci4-cms-erp/ci4ms
NoYesApr 08, 2026
CVE-2026-39976HIGH7.1
  • PHPPHP
  • laravel/passport
NoYesApr 09, 2026
CVE-2026-39392MEDIUM5.5
  • PHPPHP
  • ci4-cms-erp/ci4ms
NoYesApr 08, 2026
CVE-2026-39391MEDIUM4.8
  • PHPPHP
  • ci4-cms-erp/ci4ms
NoYesApr 08, 2026

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