GHSA-f5vj-f2hx-8m93

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GHSA-f5vj-f2hx-8m93

Summary: webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints

Details: ### 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: 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