GHSA-jcc7-9wpm-mj36

Source

https://github.com/advisories/GHSA-jcc7-9wpm-mj36

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-jcc7-9wpm-mj36/GHSA-jcc7-9wpm-mj36.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-jcc7-9wpm-mj36

Aliases

CVE-2026-27977

Published

2026-03-17T15:29:48Z

Modified

2026-03-25T19:49:01.129152Z

Severity

2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Next.js: null origin can bypass dev HMR websocket CSRF checks

Details

Summary

In next dev, cross-site protections for internal development endpoints could treat Origin: null as a bypass case even when allowedDevOrigins is configured. This could allow privacy-sensitive or opaque browser contexts, such as sandboxed documents, to access privileged internal dev-server functionality unexpectedly.

Impact

If a developer visits attacker-controlled content while running an affected next dev server with allowedDevOrigins configured, attacker-controlled browser code may be able to connect to internal development endpoints and interact with sensitive dev-server functionality that should have remained blocked.

This issue affects development mode only. It does not affect next start, and it does not expose internal debugging functionality to the network by default.

Patches

Fixed by validating Origin: null through the same cross-site origin-allowance checks used for other origins on internal development endpoints.

Workarounds

If upgrade is not immediately possible: - Do not expose next dev to untrusted networks. - If you use allowedDevOrigins, reject requests and websocket upgrades with Origin: null for internal dev endpoints at your proxy.

Database specific

{
    "cwe_ids": [
        "CWE-1385"
    ],
    "github_reviewed_at": "2026-03-17T15:29:48Z",
    "nvd_published_at": "2026-03-18T00:16:19Z",
    "severity": "LOW",
    "github_reviewed": true
}

References

Affected packages

npm / next

Package

Name: next; View open source insights on deps.dev
Purl: pkg:npm/next

Affected ranges

Type: SEMVER
Events: Introduced

16.0.1

Fixed

16.1.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-jcc7-9wpm-mj36/GHSA-jcc7-9wpm-mj36.json"