CVE-2026-6402
webpack-dev-server: webpack-dev-server: Information disclosure due to cross-origin source code exposure
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 12, 2026
Updated · October 27, 2026
Description
A flaw was found in webpack-dev-server. When the development server operates over plain HTTP, a remote attacker can exploit a cross-origin source code exposure vulnerability. This allows a malicious website, visited by a developer, to load the bundled application source code as a script and read it across origins. Consequently, this could lead to the disclosure of sensitive application source code.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.3CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-346 · Origin Validation Error