Authentication Bypass Using an Alternate Path or Channel Affecting next package, versions >=15.2.0-canary.0 <15.5.16>=16.0.0-beta.0 <16.2.5
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-16638685
- published11 May 2026
- disclosed11 May 2026
- creditUnknown
Introduced: 11 May 2026
NewCVE-2026-44575 (opens in a new tab)How to fix?
Upgrade next to version 15.5.16, 16.2.5 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the handling of segment-prefetch routes. An attacker can gain unauthorized access to protected content by crafting .rsc and segment-prefetch URLs that bypass intended authorization checks in middleware or proxy-based configurations.
Notes:
- This is only exploitable if authorization is enforced solely through middleware or proxy checks, and not within the underlying route or page logic.
- This fix is incomplete and does not cover
middleware.tswith Turbopack enabled. For additional details see CVE-2026-45109
Workaround
This vulnerability can be mitigated by enforcing authorization within the underlying route or page logic rather than relying solely on middleware.