{"id":"CVE-2026-14620","aliases":["GHSA-f5vj-f2hx-8m93"],"url":"https://o3.security/vulnerability/CVE-2026-14620","summary":"webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints","details":"### Impact\n\nThe 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.\n\nAn 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.\n\n### Patches\n\nFixed 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)).\n\n### Workarounds\n\nNone","published":"2026-07-03T17:00:00.679Z","modified":"2026-10-21T02:56:01.823306771Z","cvss":{"score":4.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L"},"epss":{"score":0.00521,"percentile":0.42784,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"webpack-dev-server","fixedVersion":"5.2.6"}],"fix":{"url":"https://github.com/webpack/webpack-dev-server/pull/5698","label":"webpack/webpack-dev-server#5698"},"references":[{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14620.json"},{"type":"ADVISORY","url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-14620"},{"type":"WEB","url":"https://github.com/webpack/webpack-dev-server/pull/5698"},{"type":"WEB","url":"https://github.com/webpack/webpack-dev-server/commit/80cd9eea54975fe632a518d8bd902a260f374e7c"},{"type":"PACKAGE","url":"https://github.com/webpack/webpack-dev-server"},{"type":"WEB","url":"https://github.com/webpack/webpack-dev-server/releases/tag/v5.2.6"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:56:01.823306771Z"}}