{"id":"CVE-2026-39976","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-39976","generatedAt":"2026-10-28T02:20:43.771Z","title":"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).","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.","published":"2026-04-09T17:16:31.000Z","lastModified":"2026-10-26T21:10:00.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"},"cwe":["CWE-287"],"affected":["laravel/passport"],"epss":{"score":0.00289,"percentile":0.21282,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/laravel/passport/issues/1900","tags":["Exploit","Issue Tracking"],"source":"security-advisories@github.com"},{"url":"https://github.com/laravel/passport/pull/1901","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/laravel/passport/pull/1902","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6","tags":["Mitigation","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-39976","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}