webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0036, the 29th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 4 Jun 2025. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-9jgg-88mc-972h
• OSV: GHSA-9jgg-88mc-972h
• github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h
• nvd.nist.gov/vuln/detail/CVE-2025-30360
• github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e
• github.com/webpack/webpack-dev-server/commit/72efaab83381a0e1c4914adf401cbd210b7de7eb
• github.com/webpack/webpack-dev-server/commit/d2575ad8dfed9207ed810b5ea0ccf465115a2239
• github.com/webpack/webpack-dev-server
• github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.