CVE-2026-6402
- Source
- https://cve.org/CVERecord?id=CVE-2026-6402
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6402.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-6402
- Aliases
- Downstream
- Related
- Published
- 2026-05-12T07:45:21.253Z
- Modified
- 2026-07-08T22:29:20.256305385Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
- Details
-
webpack-dev-server versions up to and including 5.2.3 are vulnerable to cross-origin source code exposure when serving over a non-potentially trustworthy origin such as plain HTTP. The previous fix relied on the Sec-Fetch-Mode and Sec-Fetch-Site request headers, which browsers omit for non-trustworthy origins, allowing a malicious site to load the bundled source as a script and read it across origins. Impact: an attacker controlling a website visited by a developer running webpack-dev-server can recover the application source code when the dev server runs over HTTP at a guessable host and port. Chromium based browsers from Chrome 142 onward are not affected due to local network access restrictions. Upgrade to webpack-dev-server 5.2.4 or later, which sets Cross-Origin-Resource-Policy: same-origin on responses.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6402.json", "cna_assigner": "openjs", "cwe_ids": [ "CWE-749" ] }- References
Affected packages
Git / github.com/webpack/webpack-dev-server
Affected ranges
- Type
- GIT
- Repo
- https://github.com/webpack/webpack-dev-server
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "cpe": "cpe:2.3:a:webpack.js:webpack-dev-server:*:*:*:*:*:*:*:*", "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "extracted_events": [ { "introduced": "0" }, { "fixed": "5.2.4" } ] }