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CVE-2026-73421 is a critical fail-open authorization flaw in NextAuth.js (next-auth) affecting versions from 5.0.0-beta.0 through before 5.0.0-beta.32. In affected versions, server-side entry points such as middleware, Route Handlers, React Server Components, and other auth() wrapper consumers can incorrectly treat unauthenticated requests as authenticated when Auth.js encounters a server configuration error. Instead of returning null for a non-OK session response, the auth() path parses the response into a truthy error object. Applications that protect routes using only existence-based checks such as !!auth or if (req.auth) therefore grant access even though no valid session exists. The condition can be triggered by configuration problems including a provider missing both issuer and authorization endpoint values, an unset AUTH_SECRET, or other server configuration errors. The vulnerability has no effect while configuration remains valid, but a misconfigured deployment can silently convert protected routes into publicly accessible ones.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.