CVE-2026-445788.6HighCWE-918

CVE-2026-44578: Next.js: Server-side request forgery in applications using WebSocket upgrades

vercel · next.js

Fixed in 15.5.16 · Affected: vercel next.js before 15.5.16 · Exploitation: check available, not yet exploited

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

35.5%probability of exploitation in the next 30 days

98th percentile

050100

Higher than 98% of scored CVEs

8.6HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

vercel · next.js>= 16.0.0, < 16.2.5; >= 13.4.13, < 15.5.16

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
CISA KEV: Not listed
Public check: Next.js WebSocket Upgrade Handler - SSRF · nuclei template in projectdiscovery/nuclei-templates
Weakness: Server-Side Request Forgery
Vendor: vercel
Published: May 2026
Band: Check available, not yet exploited, May 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-44578 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.