CVE-2026-14620

Description

### 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

How to fix CVE-2026-14620

To remediate CVE-2026-14620, upgrade the affected package to a fixed version below.

• —upgrade to 5.2.6 or later

Is CVE-2026-14620 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 5.2.6

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-14620
• PATCHgithub.com/webpack/webpack-dev-server
• WEBcna.openjsf.org/security-advisories.html
• WEBgithub.com/webpack/webpack-dev-server/commit/80cd9eea54975fe632a518d8bd902a260f374e7c