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GHSA-jcc7-9wpm-mj36

LowCVSS 2.3 / 10

Published Mar 17, 2026·Last modified Mar 25, 2026

Affected Components(0)

No affected components available

Description

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.

Risk Scores

Base Score

2.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.

Threat Intelligence

0.6

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS

0.17%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Low severity

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