{"apiVersion":"1.0","identifier":"CVE-2026-73419","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.","publishedAt":"2026-08-12T21:17:41","lastModifiedAt":"2026-08-13T16:19:04","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73419","cvssScore":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","epssProbability":0.00193,"riskScore":0.69,"affectedProduct":"next-auth","affectedVersions":"<4.24.15, <5.0.0-beta.32","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-73419","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-73419","en":"https://www.redsauce.net/en/cves/CVE-2026-73419","fr":"https://www.redsauce.net/fr/cves/CVE-2026-73419","pt":"https://www.redsauce.net/pt/cves/CVE-2026-73419","de":"https://www.redsauce.net/de/cves/CVE-2026-73419","sk":"https://www.redsauce.net/sk/cves/CVE-2026-73419","el":"https://www.redsauce.net/el/cves/CVE-2026-73419"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-73419"}}