# CVE-2026-14620: webpack webpack-dev-server CSRF in developer endpoints

Source: https://junglewise.ai/threats/cve-2026-14620-webpack-webpack-dev-server-csrf-in-developer-endpoints  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-03. Updated: 2026-07-20  
License: CC BY 4.0 with a link back

CVE-2026-14620 · Severity: medium · CVSS 4.7 · Published 2026-07-03

A vulnerability in the webpack-dev-server, a tool used by developers to preview web applications, allows malicious websites to interfere with a developer's local machine. If a developer visits a compromised site while the server is running, an attacker can force the developer's code editor to open sensitive local files or repeatedly trigger resource-intensive tasks. This can lead to a loss of productivity and potential exposure of local file paths, though the actual content of the files is not directly sent to the attacker.

Technologies: [webpack-dev-server (npm)](https://junglewise.ai/threats/technologies/webpack-dev-server). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-14620 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-14620 being exploited in the wild.

**How severe is CVE-2026-14620?** Medium severity, with a CVSS score of 4.7, published 3 July 2026.

**Which products and versions are affected?** webpack-dev-server (npm) <= 5.2.5, SEMVER:introduced=0,fixed=5.2.6.

**Is there a fix for CVE-2026-14620?** Yes. webpack-dev-server (npm): upgrade to 5.2.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-14620 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-14620?** Check whether you run webpack-dev-server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- webpack-dev-server (npm): upgrade to 5.2.6 or later

  ```sh
  npm install webpack-dev-server@5.2.6
  ```


## Technical details

The internal `/webpack-dev-server/open-editor` and `/webpack-dev-server/invalidate` endpoints in webpack-dev-server perform state-changing actions upon receiving HTTP GET requests without implementing CSRF protections. Because these endpoints do not verify the origin of the request, a remote attacker can use a malicious website to trigger these actions via a developer's browser. An exploit can force the developer's local editor to open arbitrary files (including those outside the project root like SSH configs) or trigger repeated recompilations and process spawning to cause a Denial of Service (DoS) on the developer's machine. The issue is fixed in version 5.2.6 by rejecting cross-site requests to these endpoints.

## Affected products

- webpack webpack-dev-server <= 5.2.5

## Identifiers

- CVE-2026-14620
- GHSA-f5vj-f2hx-8m93

## Timeline

- 2026-07-03: disclosed
- 2026-07-20: advisory: GitHub Advisory published
- 2026-07-20: patched: Fixed in version 5.2.6

## References

- [https://api.github.com/users/Pig-Tail](https://api.github.com/users/Pig-Tail)
- [https://github.com/Pig-Tail](https://github.com/Pig-Tail)
- [https://api.github.com/users/Pig-Tail/gists%7B/gist_id%7D](https://api.github.com/users/Pig-Tail/gists%7B/gist_id%7D)
- [https://api.github.com/users/Pig-Tail/repos](https://api.github.com/users/Pig-Tail/repos)
- [https://avatars.githubusercontent.com/u/15832659?v=4](https://avatars.githubusercontent.com/u/15832659?v=4)
- [https://api.github.com/users/Pig-Tail/events%7B/privacy%7D](https://api.github.com/users/Pig-Tail/events%7B/privacy%7D)

## Related threats

- [webpack webpack-dev-server Denial of Service via malformed headers](https://junglewise.ai/threats/cve-2026-14631-webpack-webpack-dev-server-denial-of-service-via-malformed)
- [webpack-dev-server HMR WebSocket interception via permissive proxies](https://junglewise.ai/threats/cve-2026-9595-webpack-dev-server-hmr-websocket-interception-via-permissive)
- [webpack webpack-dev-server cross-origin source code exposure](https://junglewise.ai/threats/cve-2026-6402-webpack-webpack-dev-server-cross-origin-source-code-exposure)
- [webpack-dev-server source code disclosure via WebSocket in non-Chromium browsers](https://junglewise.ai/threats/cve-2025-30360-webpack-dev-server-source-code-disclosure-via-websocket-in-non)
- [webpack-dev-server source code disclosure via cross-origin requests](https://junglewise.ai/threats/cve-2025-30359-webpack-dev-server-source-code-disclosure-via-cross-origin)