{"id":"CVE-2026-40155","aliases":["EUVD-2026-23537","GHSA-xq8m-7c5p-c2r6"],"status":"published","title":"Auth0 Next.js SDK has Improper Proxy Cache Lookup","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00214,"percentile":0.1188,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362","CWE-863"],"published":"2026-04-17T20:54:38Z","modified":"2026-10-28T02:30:25Z","fixes":[{"ecosystem":"npm","package":"@auth0/nextjs-auth0","fixed_in":["4.18.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@auth0/nextjs-auth0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.12.0"},{"last_affected":"4.17.0"},{"fixed":"4.18.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@auth0/nextjs-auth0","ranges":[{"type":"SEMVER","events":[{"introduced":"4.12.0"},{"fixed":"4.18.0"}]}]}],"products":[{"vendor":"auth0","product":"nextjs-auth0"}],"references":[{"url":"https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40155","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xq8m-7c5p-c2r6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40155.json","tags":["advisory"]},{"url":"https://github.com/auth0/nextjs-auth0","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-40155","title":"Auth0 Next.js SDK has Improper Proxy Cache Lookup","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.","status":"published","published":"2026-04-17T20:54:38.958Z","modified":"2026-04-20T14:57:32.023Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-863","CWE-362"],"updated_at":"2026-11-02T13:43:11.445168Z"}],"euvd":[{"id":"EUVD-2026-23537","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.","status":"published","published":"2026-04-17T20:54:38Z","modified":"2026-04-20T14:57:32Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:22.446697Z"}],"ghsa":[{"id":"GHSA-xq8m-7c5p-c2r6","title":"Auth0 Next.js SDK has Improper Proxy Cache Lookup","description":"### Description\nIn affected versions of the Next.js SDK, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results.\n\n### Which Projects are Affected?\nUsers are affected if they meet all of the following preconditions:\n- Applications using the auth0/nextjs-auth0 SDK, versions 4.12.0 to 4.17.0, and\n- Applications using the proxy handler  /me/* and /my-org/* with DPoP enabled.\n\n\n### Affected product and versions\nAuth0/nextjs-auth0 v4.12.0 to 4.17.0\n\n### Resolution\nUpgrade Auth0/nextjs-auth0 version to v4.18.0 or greater\n\n### Acknowledgements\nOkta would like to thank Reynaldo Immanuel for their discovery and responsible disclosure.","status":"published","published":"2026-04-21T15:21:46Z","modified":"2026-04-21T15:21:47Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-362","CWE-863"],"updated_at":"2026-11-02T14:39:55.105822Z"}],"nvd":[{"id":"CVE-2026-40155","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.","status":"published","published":"2026-04-17T21:16:33.713Z","modified":"2026-06-17T10:44:47.06Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-362","CWE-863"],"updated_at":"2026-11-02T14:12:15.120927Z"}],"osv":[{"id":"CVE-2026-40155","title":"Auth0 Next.js SDK has Improper Proxy Cache Lookup","description":"The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.","status":"published","published":"2026-04-17T20:54:38.958Z","modified":"2026-10-28T02:30:25.096787915Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-362","CWE-863"],"updated_at":"2026-11-02T15:45:03.040464Z"},{"id":"GHSA-xq8m-7c5p-c2r6","title":"Auth0 Next.js SDK has Improper Proxy Cache Lookup","description":"### Description\nIn affected versions of the Next.js SDK, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results.\n\n### Which Projects are Affected?\nUsers are affected if they meet all of the following preconditions:\n- Applications using the auth0/nextjs-auth0 SDK, versions 4.12.0 to 4.17.0, and\n- Applications using the proxy handler  /me/* and /my-org/* with DPoP enabled.\n\n\n### Affected product and versions\nAuth0/nextjs-auth0 v4.12.0 to 4.17.0\n\n### Resolution\nUpgrade Auth0/nextjs-auth0 version to v4.18.0 or greater\n\n### Acknowledgements\nOkta would like to thank Reynaldo Immanuel for their discovery and responsible disclosure.","status":"published","published":"2026-04-21T15:21:46Z","modified":"2026-04-21T15:56:31.005142Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-362","CWE-863"],"updated_at":"2026-11-02T15:47:00.198893Z"}]}}