Next.js is a React framework for building full-stack web applications.
CVE-2026-44574
Impact Applications that rely on middleware to protect dynamic routes can be vulnerable to authorization bypass. In affected deployments, specially crafted query parameters can alter the dynamic route value seen by the page while leaving the visible path unchanged, which can allow protected content to be rendered without passing the expected middleware check. Fix We now only honor internal route-parameter normalization in trusted routing flows and ignore externally supplied parameter encodings that should never have been accepted from ordinary requests. Workarounds If you cannot upgrade immediately, enforce authorization in route or page logic instead of relying solely on middleware path matching.
Assessment
- CVSS
- 8.1 (v3.1)
- Severity
- High
- EPSS
- 0.64% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 11 May 2026
- Last updated
- 26 October 2026
- Weakness
- CWE-288, CWE-551
- Assigner
- security-advisories@github.com
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
At the source
References
- https://github.com/vercel/next.js/security/advisories/GHSA-492v-c6pp-mqqv
- https://access.redhat.com/errata/RHSA-2026:34608
- https://access.redhat.com/errata/RHSA-2026:37272
- https://access.redhat.com/errata/RHSA-2026:40974
- https://access.redhat.com/errata/RHSA-2026:54435
- https://access.redhat.com/security/cve/CVE-2026-44574
- https://bugzilla.redhat.com/show_bug.cgi?id=2477207
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44574.json
- https://github.com/vercel/next.js/releases/tag/v15.5.16
- https://github.com/vercel/next.js/releases/tag/v16.2.5
- https://nvd.nist.gov/vuln/detail/CVE-2026-44574
- https://github.com/advisories/GHSA-492v-c6pp-mqqv
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