{"cve":"CVE-2026-73419","nvd":{"published":"2026-08-12T21:17:41.033","modified":"2026-09-09T20:58:37.713","status":"Awaiting Analysis","description":"NextAuth.js provides authentication for Next.js. Prior to@auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32, Auth.js stores the OAuth/OIDC anti-CSRF checks state, nonce, and the PKCE verifier in global cookies that are not bound to the provider that created them. On callback, a check value minted during a sign-in started with one provider can satisfy the callback for a different provider because the stored cookie is not verified against the callback provider's identity, including the provider ID, issuer, client ID, or redirect URI. In a multi-provider application that permits account linking while logged in, when one provider's authorization request is observable and a target provider callback can be satisfied without a PKCE verifier, an attacker can lure a victim into starting a legitimate same-origin flow and link the attacker's target-provider account to the victim's Auth.js user. The linked provider grants the attacker persistent sign-in to the victim's account, while cross-site request forgery alone is insufficient. This issue is fixed in @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","score":6.8},"cwes":["CWE-345","CWE-346","CWE-940"],"references":["https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05","https://github.com/nextauthjs/next-auth/commit/9f7a97fade9b1319bb9ac19fc9828d62e0a2a852","https://github.com/nextauthjs/next-auth/pull/13469","https://github.com/nextauthjs/next-auth/releases/tag/@auth/core@0.41.3","https://github.com/nextauthjs/next-auth/releases/tag/next-auth@4.24.15"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-73419","score":0.00249,"percentile":0.16286,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-x445-f3h2-j279","url":"https://osv.dev/vulnerability/GHSA-x445-f3h2-j279","summary":"Auth.js: OAuth state, nonce, and PKCE check cookies are not bound to the provider that created them","modified":"2026-09-10T03:50:53.095011411Z","packages":[{"ecosystem":"npm","name":"@auth/core","purl":"pkg:npm/%40auth/core","ranges":["<0.41.3"],"fixed":["0.41.3"]},{"ecosystem":"npm","name":"next-auth","purl":"pkg:npm/next-auth","ranges":[">=5.0.0-beta.1 <5.0.0-beta.32"],"fixed":["5.0.0-beta.32"]},{"ecosystem":"npm","name":"next-auth","purl":"pkg:npm/next-auth","ranges":["<4.24.15"],"fixed":["4.24.15"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}