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CVE-2026-39976

Laravel Passport authentication bypass

7.1 HIGHPublic exploitEPSS 0.40%
  1. Published9 Apr 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

Affected products

Laravel Passport≥ 13.0.0 < 13.7.1

Remediation

Fixed in
Laravel Passport≥ 13.7.1

References

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Frequently asked

Is CVE-2026-39976 being actively exploited?

CVE-2026-39976 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-39976?

CVE-2026-39976 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-39976?

Affected products include Laravel Passport.

How do I fix CVE-2026-39976?

Upgrade affected software to a fixed version, for example Laravel Passport 13.7.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39976 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.