{"id":"CVE-2021-43812","aliases":["EUVD-2021-2425","GHSA-2mqv-4j3r-vjvp"],"status":"published","title":"Open redirect in nextjs-auth0","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.","severity":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00677,"percentile":0.52567,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2021-12-16T18:20:12Z","modified":"2026-10-20T10:55:04Z","fixes":[{"ecosystem":"npm","package":"@auth0/nextjs-auth0","fixed_in":["1.6.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@auth0/nextjs-auth0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@auth0/nextjs-auth0","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.6.2"}]}]}],"products":[{"vendor":"auth0","product":"nextjs-auth0"}],"references":[{"url":"https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvp","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/auth0/nextjs-auth0/commit/0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43812","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2mqv-4j3r-vjvp"},{"url":"https://github.com/auth0/nextjs-auth0","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-43812","title":"Open redirect in nextjs-auth0","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.","status":"published","published":"2021-12-16T18:20:12Z","modified":"2024-08-04T04:03:08.682Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-2425","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.","status":"published","published":"2021-12-16T18:20:12Z","modified":"2024-08-04T04:03:08Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:13.772922Z"}],"ghsa":[{"id":"GHSA-2mqv-4j3r-vjvp","title":"Open redirect in @auth0/nextjs-auth0","description":"### Overview\n\nVersions `\u003c=1.6.1` do not filter out certain `returnTo` parameter values from the login url, which expose the application to an open redirect vulnerability.\n\n### Am I affected?\nYou are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `\u003c=1.6.1`.\n\n### How to fix that?\nUpgrade to version `\u003e=1.6.2`\n\n### Will this update impact my users?\nThe fix provided in the patch will not affect your users.\n\n","status":"published","published":"2021-12-16T18:52:21Z","modified":"2023-02-01T05:06:51Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:36:39.76883Z"}],"nvd":[{"id":"CVE-2021-43812","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.","status":"published","published":"2021-12-16T19:15:08.353Z","modified":"2026-06-17T04:11:29.333Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:07:02.566991Z"}],"osv":[{"id":"CVE-2021-43812","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.","status":"published","published":"2021-12-16T19:15:08.353Z","modified":"2026-10-20T10:55:04.295962691Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:21.877444Z"},{"id":"GHSA-2mqv-4j3r-vjvp","title":"Open redirect in @auth0/nextjs-auth0","description":"### Overview\n\nVersions `\u003c=1.6.1` do not filter out certain `returnTo` parameter values from the login url, which expose the application to an open redirect vulnerability.\n\n### Am I affected?\nYou are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `\u003c=1.6.1`.\n\n### How to fix that?\nUpgrade to version `\u003e=1.6.2`\n\n### Will this update impact my users?\nThe fix provided in the patch will not affect your users.\n\n","status":"published","published":"2021-12-16T18:52:21Z","modified":"2026-07-08T06:28:49.665321049Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:34.700741Z"}]}}