VULNERABILITY INTELLIGENCE

CVE-2026-44575

CVSS score7.5 HIGH
EPSS probability0.76%
CISA KEVNot currently listed
Published2026-05-13
Last modified2026-08-13
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.

Weakness classification

  • CWE-288: Authentication Bypass Using an Alternate Path or Channel
  • CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Primary references