GHSA-f5vj-f2hx-8m93
webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | webpack-dev-server | < 5.2.6 | 5.2.6 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
The internal `/webpack-dev-server/open-editor` and `/webpack-dev-server/invalidate` endpoints 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 them 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 (e.g. `~/.ssh/config`). The file's contents are not returned to the attacker. Repeated requests can also spawn editor processes and force recompilations, degrading the developer's machine.
### Patches
Fixed in `webpack-dev-server` 5.2.6 by rejecting cross-site requests to the `/webpack-dev-server/open-editor` and `/webpack-dev-server/invalidate` endpoints (see [PR #5698](https://github.com/webpack/webpack-dev-server/pull/5698)).
### Workarounds
None
References
External links from the advisory. They lead to third-party sites.
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93
- https://nvd.nist.gov/vuln/detail/CVE-2026-14620
- https://github.com/webpack/webpack-dev-server/pull/5698
- https://github.com/webpack/webpack-dev-server/commit/80cd9eea54975fe632a518d8bd902a260f374e7c
- https://cna.openjsf.org/security-advisories.html
- https://github.com/webpack/webpack-dev-server
- https://github.com/webpack/webpack-dev-server/releases/tag/v5.2.6