Next.js Framework 12.2.x < 15.5.16 / 16.x < 16.2.5 Information Disclosure

high Nessus Plugin ID 314910

Synopsis

The Next.js Framework on the remote host is affected by an information disclosure vulnerability.

Description

The Next.js Framework on the remote host is affected by an information disclosure vulnerability:

- Applications using the Pages Router with i18n configured and middleware/proxy-based authorization can allow unauthorized access to protected page data through locale-less /_next/data/<buildId>/<page>.json requests. In affected configurations, middleware does not run for the unprefixed data route, allowing an attacker to retrieve SSR JSON for protected pages without passing the intended authorization checks. (CVE-2026-44573)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Next.js Framework version 15.5.16 or 16.2.5 or later.

Plugin Details

Severity: High

ID: 314910

File Name: nextjs_framework_CVE-2026-44573.nasl

Version: 1.2

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 5/15/2026

Updated: 5/15/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2026-44573

CVSS v3

Risk Factor: High

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vulnerability Information

CPE: cpe:/a:vercel:next.js

Required KB Items: Host/nodejs/modules/enumerated

Patch Publication Date: 5/11/2026

Vulnerability Publication Date: 5/11/2026

Reference Information

CVE: CVE-2026-44573

IAVA: 2026-A-0443

Detections

Analytics