CVE-2026-14620
webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints
- Published
- Jul 3, 2026
- Updated
- Jul 6, 2026
- Assigning CNA
- openjs
- Evidence observed
- Aug 17, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:LLow · next 30 days
- Percentile
- 43.0%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
PoCs & write-ups for CVEs I reported (coordinated disclosure; published + patched only)
Jorge González Milla · multiple · Aug 17, 2026
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