Authentication Bypass Using an Alternate Path or Channel Affecting next package, versions >=15.2.0-canary.0 <15.5.18>=16.0.0-beta.0 <16.2.6
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-NEXT-16638686
- published11 May 2026
- disclosed11 May 2026
- creditUnknown
Introduced: 11 May 2026
NewCVE-2026-45109 (opens in a new tab)How to fix?
Upgrade next to version 15.5.18, 16.2.6 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel via the middleware.ts with Turbopack enabled. An attacker can gain unauthorized access to protected resources by bypassing authentication mechanisms through specially crafted segment-prefetch routes.
Note: This vulnerability relates to the incomplete fix of CVE-2026-44575