{"id":"CVE-2020-15240","details":"omniauth-auth0 (rubygems) versions \u003e= 2.3.0 and \u003c 2.4.1 improperly validate the JWT token signature when using the `jwt_validator.verify` method. Improper validation of the JWT token signature can allow an attacker to bypass authentication and authorization. You are affected by this vulnerability if all of the following conditions apply: 1. You are using `omniauth-auth0`. 2. You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK’s default Authorization Code Flow. The issue is patched in version 2.4.1.","aliases":["GHSA-58r4-h6v8-jcvm"],"modified":"2026-07-09T06:34:42.489654Z","published":"2020-10-21T18:15:12.813Z","references":[{"type":"ADVISORY","url":"https://github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm"},{"type":"ADVISORY","url":"https://rubygems.org/gems/omniauth-auth0"},{"type":"FIX","url":"https://github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/auth0/omniauth-auth0","events":[{"introduced":"c091def58305469b55365a29c12431b8cd07cd4a"},{"fixed":"ce6824dd0ca306b5d0e7bf33fdae8404b0259da6"},{"fixed":"fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:auth0:omniauth-auth0:*:*:*:*:*:ruby:*:*","extracted_events":[{"introduced":"2.3.0"},{"fixed":"2.4.1"}]}}],"versions":["v2.4.0","v2.3.1","v2.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15240.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}