Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M
CVE-2026-73419NextAuth.js: OAuth state, nonce, and PKCE check cookies are not bound to the provider that created them
Medium 6.8
In plain English
A medium-severity insufficient verification of data authenticity in core from @auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @auth/core | 0.41.3 | GHSA-x445-f3h2-j279 |
| npm | next-auth | 5.0.0-beta.32 | GHSA-x445-f3h2-j279 |
| npm | next-auth | 4.24.15 | GHSA-x445-f3h2-j279 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextauthjs | next-auth | < 4.24.15>= 5.0.0-beta.4, < 5.0.0-beta.32 |
| @auth | core | < 0.41.3 |
Weakness: CWE-345, CWE-346, CWE-940 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
References
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-x445-f3h2-j279 x_refsource_CONFIRM
- https://github.com/nextauthjs/next-auth/pull/13469 x_refsource_MISC
- https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05 x_refsource_MISC
- https://github.com/nextauthjs/next-auth/commit/9f7a97fade9b1319bb9ac19fc9828d62e0a2a852 x_refsource_MISC
- https://github.com/nextauthjs/next-auth/releases/tag/@auth/core@0.41.3 x_refsource_MISC
- https://github.com/nextauthjs/next-auth/releases/tag/next-auth@4.24.15 x_refsource_MISC
- https://github.com/nextauthjs/next-auth/releases/tag/next-auth@5.0.0-beta.32 x_refsource_MISC