THREATPORT/VULNERABILITY/CVE-2026-44578
HIGH SEVERITY

CVE-2026-44578

Next.Js vulnerability

CVSS
8.6
EPSS
38.9%
EPSS pct
98th
Exploited
No known
Next.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 built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.
Affected vendor
Vercel
Affected product
Next.Js
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness type (CWE)
  • CWE-918 — Server-Side Request Forgery (SSRF)
Published
2026-05-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 38.9% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2026-44578

  • Confirm whether Vercel Next.Js is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-44578.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-44578

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-44578 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2026-44578?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2026-44578.

Start free scan

No credit card. Agentless.

Related vulnerabilities

HIGH
CVE-2019-1229
Dynamics 365 vulnerability
HIGH
CVE-2019-1258
Active Directory Authentication Library vulnerability
HIGH
CVE-2019-14788
Newsletters vulnerability