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 ↗

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

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

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