CVE-2026-14620
MediumCVSS 4.7Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability in webpack-dev-server versions 5.2.5 and earlier allows an attacker to perform unauthorized actions on the dev server by sending GET requests to internal endpoints. The attack requires no user interaction beyond the developer visiting a malicious website while the dev server is running.
Risk Assessment
The risk includes the ability to open arbitrary local files in the developer's editor, including files outside the project root, and to overload the developer's machine by spawning editor processes and forcing recompilations, potentially leading to performance degradation and sensitive data exposure.
Recommendation
Upgrade webpack-dev-server to version 5.2.6 or later immediately. No workarounds are available.
Other vulnerabilities in webpack-dev-server
See all- CVE-2026-14631Medium
A vulnerability in webpack-dev-server versions 5.2.5 and earlier crashes the entire Node.js process when an unauthenticated peer sends a malformed Host header in an HTTP request or a malformed Origin header in a WebSocket upgrade. The malformed value triggers an uncaught exception in the host-validation path, crashing the dev server.
- CVE-2026-9595Medium
A vulnerability in webpack-dev-server allows for the interception of browser cookies and the Origin header when a user-configured proxy has a broad context and ws: true enabled. This leads to bypassing Host/Origin validation and corrupting the HMR socket.
Original NVD description (English source)
webpack-dev-server versions 5.2.5 and earlier expose two internal developer endpoints, /webpack-dev-server/open-editor and /webpack-dev-server/invalidate, that perform state-changing actions on any GET request without verifying that the request originated from the dev server's own page. Any website a developer visits while the dev server is running can trigger these endpoints cross-origin with no interaction beyond the visit. An attacker can open an arbitrary existing local file in the developer's editor, including files outside the project root, and repeated requests can spawn editor processes and force recompilations that degrade the developer's machine. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: none.