{"id":"CVE-2018-15121","aliases":["EUVD-2022-4591","GHSA-mmhr-3jr7-qj2p"],"status":"published","title":"Auth0-ASPNET and Auth0-ASPNET-Owin vulnerable to Cross-Site Request Forgery","description":"An issue was discovered in Auth0 auth0-aspnet and auth0-aspnet-owin. Affected packages do not use or validate the state parameter of the OAuth 2.0 and OpenID Connect protocols. This leaves applications vulnerable to CSRF attacks during authentication and authorization operations.","severity":{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00486,"percentile":0.42156,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-352"],"published":"2018-08-29T03:00:00Z","modified":"2026-06-17T01:42:04Z","affected":[{"source":"ghsa","ecosystem":"NuGet","package":"Auth0-ASPNET-Owin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.3.2"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"auth0-aspnet","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.1.1"}]}]},{"source":"osv","ecosystem":"NuGet","package":"Auth0-ASPNET-Owin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.3.2"}]}],"versions":["0.4.1","0.4.2","0.4.3","0.4.4","0.4.5","0.4.6","0.4.7","0.5.0","0.6.0","0.6.1","0.6.2","1.0.0","1.0.1","1.0.2","1.0.3","1.0.4","1.1.0","1.1.1","2.0.0","2.0.0-beta1","2.0.0-beta2","2.1.0","2.2.0","2.2.1","2.2.2","2.3.0","2.3.1","2.3.2"]},{"source":"osv","ecosystem":"NuGet","package":"auth0-aspnet","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.1.1"}]}],"versions":["0.9.2","0.9.3","0.9.4","0.9.5","0.9.7","1.0.0","1.1.0","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.4.0","1.5.0","1.5.0-beta1","1.5.0-beta2","1.5.0-beta3","1.6.0","2.0.0","2.1.0","2.1.1"]}],"products":[{"vendor":"auth0","product":"aspnet"},{"vendor":"auth0","product":"aspnet-owin"}],"references":[{"url":"https://auth0.com/docs/security/bulletins/cve-2018-15121","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-15121","tags":["advisory"]},{"url":"https://www.nuget.org/packages/Auth0-ASPNET-Owin","tags":["web"]},{"url":"https://github.com/advisories/GHSA-mmhr-3jr7-qj2p"},{"url":"https://github.com/auth0/auth0-aspnet-owin","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2018-15121","description":"An issue was discovered in Auth0 auth0-aspnet and auth0-aspnet-owin. Affected packages do not use or validate the state parameter of the OAuth 2.0 and OpenID Connect protocols. This leaves applications vulnerable to CSRF attacks during authentication and authorization operations.","status":"published","published":"2018-08-29T03:00:00Z","modified":"2024-08-05T09:46:25.297Z","updated_at":"2026-11-02T14:35:03.288698Z"}],"euvd":[{"id":"EUVD-2022-4591","description":"An issue was discovered in Auth0 auth0-aspnet and auth0-aspnet-owin. Affected packages do not use or validate the state parameter of the OAuth 2.0 and OpenID Connect protocols. This leaves applications vulnerable to CSRF attacks during authentication and authorization operations.","status":"published","published":"2018-08-29T03:00:00Z","modified":"2024-08-05T09:46:25Z","updated_at":"2026-11-03T02:39:44.728742Z"}],"ghsa":[{"id":"GHSA-mmhr-3jr7-qj2p","title":"Auth0-ASPNET and Auth0-ASPNET-Owin vulnerable to Cross-Site Request Forgery","description":"An issue was discovered in Auth0 auth0-aspnet and auth0-aspnet-owin. Affected packages do not use or validate the state parameter of the OAuth 2.0 and OpenID Connect protocols. This leaves applications vulnerable to CSRF attacks during authentication and authorization operations.","status":"published","published":"2022-05-14T02:01:18Z","modified":"2023-05-24T14:56:45Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T14:36:53.103029Z"}],"nvd":[{"id":"CVE-2018-15121","description":"An issue was discovered in Auth0 auth0-aspnet and auth0-aspnet-owin. Affected packages do not use or validate the state parameter of the OAuth 2.0 and OpenID Connect protocols. This leaves applications vulnerable to CSRF attacks during authentication and authorization operations.","status":"published","published":"2018-08-29T03:29:00.243Z","modified":"2026-06-17T01:42:04.817Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T14:04:36.842579Z"}],"osv":[{"id":"GHSA-mmhr-3jr7-qj2p","title":"Auth0-ASPNET and Auth0-ASPNET-Owin vulnerable to Cross-Site Request Forgery","description":"An issue was discovered in Auth0 auth0-aspnet and auth0-aspnet-owin. Affected packages do not use or validate the state parameter of the OAuth 2.0 and OpenID Connect protocols. This leaves applications vulnerable to CSRF attacks during authentication and authorization operations.","status":"published","published":"2022-05-14T02:01:18Z","modified":"2023-11-08T03:59:57.299055Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T15:46:52.170928Z"}]}}