7.1

CVE-2026-39976: laravel passport Improper Authentication

CVSS: 7.1v3.1HighAnalyzed
Published 09-04-2026Last modified 09-04-2026
Open JSON

Vulnerability summary

CVE-2026-39976 is a high (CVSS 7.1) Improper Authentication vulnerability in laravel passport. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
38/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.40%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 09-04-2026
    PublishedVulnerability first disclosed.
  2. 09-04-2026
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

+0.11 pp

From 0.29% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Passport

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Laravel1 product

1 vendor · 1 product

References

5 links