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CVE-2026-40155 affects the Auth0 Next.js SDK in versions 4.12.0 through 4.17.1. The vulnerability is a race condition in handling simultaneous requests that trigger a nonce retry, causing the proxy cache fetcher to perform improper lookups for token request results. In affected deployments, this can result in token request results or related cached proxy responses being associated with the wrong concurrent user. The issue is specifically described as affecting projects that use the proxy handler paths /me/* and /my-org/* with DPoP enabled. Under those conditions, sensitive data such as session identifiers, access tokens, or API response payloads belonging to one user may be routed to another concurrent user. The issue was fixed in version 4.18.0.
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Cross-references every affected SKU, including bundled OEM variants.
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