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Vulnerabilities

Vulnerability · CVE-2025-30360

webpack-dev-server allows users to use webpack with a development server that provides live reloading.

Published Jun 3, 2025 · catalog updated Jun 3, 2025 · webpack-dev-server allows users to

Check if you run it

No confirmed exploitation is on record for CVE-2025-30360. EPSS is 0.34%. Act only if a listed version of webpack-dev-server allows users to is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (webpack-dev-server allows users to).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Version ranges on file
Affected products
vendor webpack webpack-dev-server < 5.2.1

webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Versi

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor webpack webpack-dev-server < 5.2.1< 5.2.1

How to fix CVE-2025-30360

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-30360. EPSS is 0.34%. Act only if a listed version of webpack-dev-server allows users to is installed.

Which versions are affected?

Compare what you have installed with webpack webpack-dev-server < 5.2.1 < 5.2.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 3, 2025 · EUVD

    Detected

    webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always all

  2. Jun 3, 2025 · EUVD

    Updated

    webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always all

Sources

  • CVE.orgVulnerability recordCVE-2025-30360

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-30360

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-16764

    webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The header is checked to preven

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.