Missing Origin Validation in WebSockets Affecting next package, versions >=16.0.1 <16.1.7>=16.2.0-canary.0 <16.2.0-canary.102
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-NEXT-15674560
- published17 Mar 2026
- disclosed17 Mar 2026
- creditDavid Schütz, Radu Nesiu
Introduced: 17 Mar 2026
NewCVE-2026-27977 (opens in a new tab)How to fix?
Upgrade next to version 16.1.7, 16.2.0-canary.102 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to Missing Origin Validation in WebSockets in the internal dev endpoint when the Origin header is set to null. An attacker can interact with internal development websocket traffic by connecting from privacy-sensitive or opaque contexts, such as sandboxed documents, if the development server is accessible from attacker-controlled content.