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Vulnerabilities

Vulnerability · CVE-2026-44573

Next.js is a React framework for building full-stack web applications.

Published May 13, 2026 · catalog updated Aug 13, 2026 · Next.js is a React

Check if you run it

No confirmed exploitation is on record for CVE-2026-44573. EPSS is 0.76%. Act only if a listed version of Next.js is a React is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Next.js is a React).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.76%
Remediation
Advisory link
Affected products
cpe vercel/next.js

Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, 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/ / .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. This vulnerability is fixed in 15.5.16 and 16.2.5.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe vercel/next.jsversion unspecified

How to fix CVE-2026-44573

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-44573. EPSS is 0.76%. Act only if a listed version of Next.js is a React is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-551; CWE-863: Incorrect Authorization. EPSS 0.76%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 13, 2026 · NIST NVD

    Detected

    Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, 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/ / .json requests. In affected configurations, middleware does not run for the unprefixed data route, al

  2. Aug 13, 2026 · NIST NVD

    Updated

    Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, 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/ / .json requests. In affected configurations, middleware does not run for the unprefixed data route, al

Sources

  • CVE.orgVulnerability recordCVE-2026-44573

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-44573

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-44573

    Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, Applications using the Pages Router with i18n configured and middleware/proxy-based authorization can allow unauthorized access to protected page data through locale-l

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.