{"id":"CVE-2026-73419","state":"PUBLISHED","title":"NextAuth.js: OAuth state, nonce, and PKCE check cookies are not bound to the provider that created them","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":"2026-08-12T20:23:39.174Z","updatedAt":"2026-08-13T15:32:15.689Z","severity":{"score":6.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["nextauthjs next-auth","@auth core"],"affected":[{"vendor":"nextauthjs","product":"next-auth","versions":[{"version":"< 4.24.15","status":"affected"},{"version":">= 5.0.0-beta.4, < 5.0.0-beta.32","status":"affected"}]},{"vendor":"@auth","product":"core","versions":[{"version":"< 0.41.3","status":"affected"}]}],"references":["https://github.com/nextauthjs/next-auth/security/advisories/GHSA-x445-f3h2-j279","https://github.com/nextauthjs/next-auth/pull/13469","https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05","https://github.com/nextauthjs/next-auth/commit/9f7a97fade9b1319bb9ac19fc9828d62e0a2a852","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","https://github.com/nextauthjs/next-auth/releases/tag/next-auth@5.0.0-beta.32"],"weaknesses":["CWE-345","CWE-346","CWE-940"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73419.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73419","state":"PUBLISHED","datePublished":"2026-08-12T20:23:39.174Z","dateUpdated":"2026-08-13T15:32:15.689Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-12T14:32:11.795Z"},"containers":{"cna":{"title":"NextAuth.js: OAuth state, nonce, and PKCE check cookies are not bound to the provider that created them","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"nextauthjs","product":"next-auth","versions":[{"version":"< 4.24.15","status":"affected"},{"version":">= 5.0.0-beta.4, < 5.0.0-beta.32","status":"affected"}]},{"vendor":"@auth","product":"core","versions":[{"version":"< 0.41.3","status":"affected"}]}],"references":[{"url":"https://github.com/nextauthjs/next-auth/security/advisories/GHSA-x445-f3h2-j279","name":"https://github.com/nextauthjs/next-auth/security/advisories/GHSA-x445-f3h2-j279","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nextauthjs/next-auth/pull/13469","name":"https://github.com/nextauthjs/next-auth/pull/13469","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05","name":"https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextauthjs/next-auth/commit/9f7a97fade9b1319bb9ac19fc9828d62e0a2a852","name":"https://github.com/nextauthjs/next-auth/commit/9f7a97fade9b1319bb9ac19fc9828d62e0a2a852","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextauthjs/next-auth/releases/tag/@auth/core@0.41.3","name":"https://github.com/nextauthjs/next-auth/releases/tag/@auth/core@0.41.3","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextauthjs/next-auth/releases/tag/next-auth@4.24.15","name":"https://github.com/nextauthjs/next-auth/releases/tag/next-auth@4.24.15","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextauthjs/next-auth/releases/tag/next-auth@5.0.0-beta.32","name":"https://github.com/nextauthjs/next-auth/releases/tag/next-auth@5.0.0-beta.32","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345: Insufficient Verification of Data Authenticity","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-940","lang":"en","description":"CWE-940: Improper Verification of Source of a Communication Channel","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-12T20:23:39.174Z"},"source":{"advisory":"GHSA-x445-f3h2-j279","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-13T15:32:05.776262Z","id":"CVE-2026-73419","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-13T15:32:15.689Z"}}]}}}