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Medium, CVSS 6.3amended

DOM Clobbering Gadget found in Rspack's AutoPublicPathRuntimeModule that leads to XSS

GHSA-84jw-g43v-8gjm

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@rspack/core 1.0.0-rc.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.3 · CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Hi, Rspack|Webpack developer team! Summary We discovered a DOM Clobbering vulnerability in Webpack’s AutoPublicPathRuntimeModule. The DOM Clobbering gadget in the module can lead to cross-site scripting (XSS) in web pages where scriptless attacker-controlled HTML elements (e.g., an img tag with an unsanitized name attribute) are present. We found the real-world exploitation of this gadget in the Canvas LMS which allows XSS attack happens through an javascript code compiled by Webpack (the vulnerable part is from Webpack). We believe this is a severe issue. If Webpack’s code is not resilient to DOM Clobbering attacks, it could lead to significant security vulnerabilities in any web application using Webpack-compiled code. Details Backgrounds DOM Clobbering is a type of code-reuse attack where the attacker first embeds a piece of non-script, seemingly benign HTML markups in the webpage (e.g. through a post or comment) and leverages the gadgets (pieces of js code) living in the existing…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-84jw-g43v-8gjm

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-84jw-g43v-8gjm

Agent brief

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# Patch Next advisory brief: GHSA-84jw-g43v-8gjm

Advisory: DOM Clobbering Gadget found in Rspack's AutoPublicPathRuntimeModule that leads to XSS
IDs: GHSA-84jw-g43v-8gjm
Record: https://patchnext.com/advisories/ghsa-84jw-g43v-8gjm (revision 3, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @rspack/core 1.0.0-rc.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @rspack/core: affected < 1.0.0-rc.1; fixed in 1.0.0-rc.1

## Suggested inspection (read-only)
- `npm ls @rspack/core --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @rspack/core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-84jw-g43v-8gjm (OSV record GHSA-84jw-g43v-8gjm lists affected ranges: npm @rspack/core >=0 <1.0.0-rc.1 (fixed))
- Verified: https://github.com/advisories/GHSA-84jw-g43v-8gjm (GitHub-reviewed advisory GHSA-84jw-g43v-8gjm lists affected ranges: npm @rspack/core >=0 <1.0.0-rc.1)

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