webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints
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).
Workarounds
None
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | webpack-dev-server | < 5.2.6 | 5.2.6 |
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
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L- Weakness (CWE)
CWE-352, CWE-749- Platform
- npm
- Package
webpack-dev-server- Disclosed
- 20.07.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-f5vj-f2hx-8m93 - CC BY 4.0
Vulnerability history: webpack-dev-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 01.2019 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 6
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 4
-
webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints this entry
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