---
title: "CVE-2026-112085: webpack-dev-server - Cross-Site Request Forgery"
description: "webpack-dev-server < 5.2.7 and 6.0.0 contain a cross-site WebSocket vulnerability caused by lack of Host and Origin header validation in proxied WebSocket upgrade requests, letting malicious web pages read and write to proxied backends, exploit requires victim developer to visit malicious web page."
url: https://panop.io/threat-heartbeat/CVE-2026-112085/
---

# CVE-2026-112085 webpack-dev-server - Cross-Site Request Forgery

webpack-dev-server < 5.2.7 and 6.0.0 contain a cross-site WebSocket vulnerability caused by lack of Host and Origin header validation in proxied WebSocket upgrade requests, letting malicious web pages read and write to proxied backends, exploit requires victim developer to visit malicious web page.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-112085)

## Details

Type

Cross-Site Request Forgery

Impact

Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-346](https://cwe.mitre.org/data/definitions/346.html)

## Vendor fix

Upgrade to webpack-dev-server 5.2.7, 6.1.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-112085](https://nvd.nist.gov/vuln/detail/CVE-2026-112085)
- [https://cna.openjsf.org/security-advisories.html](https://cna.openjsf.org/security-advisories.html)
- [https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-cfqc-fj3v-j925](https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-cfqc-fj3v-j925)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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