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Vulnerabilities

Vulnerability · CVE-2025-30359

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-2025-30359. EPSS is 0.57%. 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
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.57%
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 they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables. By using against the values

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-2025-30359

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-2025-30359. EPSS is 0.57%. 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 0.57%. 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 they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the

  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 they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the

Sources

  • CVE.orgVulnerability recordCVE-2025-30359

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-30359

    30-day exploitation probability 0.6%

    first.org
  • EUVDVulnerability recordEUVD-2025-16767

    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 they access a malicious web site. Because the request for classic script by a script tag is not

    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.