CVE-2026-39976

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

April 9, 2026

Last Modified

June 2, 2026

Advisory Details (5)

Auto-updated Jun 15, 2026
Patch available. Sources: github_pr, github.
generic

v9 Client Credentials grant broken · Issue #1456 · thephpleague/oauth2-server · GitHub

https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996
github Patch Available

TokenGuard Authenticates Unrelated User for Client Credentials Tokens · Advisory · laravel/passport · GitHub

Affected: v13.7.1

https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6
github_pr Patch Available

[13.X] fix: resolve user as null when user ID matches client ID on integer key setups

Patch available: laravel/passport v13.7.2 (PR #1902 merged 2026-04-02)

https://github.com/laravel/passport/pull/1902
github_pr Patch Available

Prevent user impersonation via client credentials token

Patch available: laravel/passport v13.7.1 (PR #1901 merged 2026-04-01)

https://github.com/laravel/passport/pull/1901
generic

TokenGuard::authenticateViaBearerToken() does not validate oauth_user_id type, causing user impersonation with client_credentials tokens · Issue #1900 · laravel/passport · GitHub

https://github.com/laravel/passport/issues/1900

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
laravel/passportv13.0.0 ... v13.7.0 (20 versions)13.7.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 153 total refreshes for this CVE.

  1. 2026-09-15 03:11 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-39976?
CVE-2026-39976 is a high vulnerability published on April 9, 2026. 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…
When was CVE-2026-39976 disclosed?
CVE-2026-39976 was first published in the National Vulnerability Database on April 9, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39976 actively exploited?
CVE-2026-39976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.6% of all scored CVEs.
What is the CVSS score of CVE-2026-39976?
CVE-2026-39976 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-39976?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39976, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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