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Vulnerability record · CVE-2026-45109 · published 13 May 2026

CVE-2026-45109: Vercel next.js authentication bypass via alternate path vulnerability

Vercel · Next.Js

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.

7.5 CVSS 3.1 High EPSS 0.76% · top 46.5% CWE-288 · Authentication bypass via alternate pathCWE-358 · CWE-358
7.5CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
13 Aug 2026Last modified by NVD

Description

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6 Vendor Advisory
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-2026-45109
https://bugzilla.redhat.com/show_bug.cgi?id=2477190
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-55182React Server Components pre-auth deserialization RCEReact Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 (react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack) u…KEVEPSS 100%analysed9.1CVE-2025-29927Next.js middleware authorization bypass via x-middleware-subrequest headerNext.js versions from 1.11.4 up to (but not including) 12.3.5, 13.5.9, 14.2.25, and 15.2.3 allow authorization checks performed in middleware to be b…EPSS 99%analysed8.6CVE-2026-44578Vercel next.js server-side request forgery (ssrf) vulnerabilityNext.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the …EPSS 1.9%8.3CVE-2026-64649Vercel next.js server-side request forgery (ssrf) vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server A…EPSS 0.46%8.3CVE-2026-64642Vercel next.js improper authorization vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applica…EPSS 0.64%8.3CVE-2026-64645Vercel next.js open redirect vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a rewrites() or…EPSS 0.41%8.2CVE-2026-64641Vercel next.js vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted request…EPSS 0.86%8.2CVE-2025-57822Vercel next.js server-side request forgery (ssrf) vulnerabilityNext.js is a React framework for building full-stack web applications. Prior to versions 14.2.32 and 15.4.7, when next() was used without explicitly …EPSS 2.5%

Source: NIST National Vulnerability Database (record CVE-2026-45109), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.