XSS in jQuery as used in Drupal, Backdrop CMS, and other products

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2019-11358: 86.82% estimated exploitation activity in the next 30 days; percentile 99.74 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

jQuery from 1.1.4 until 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}, ...) because of Object.prototype pollution. If an unsanitized source object contained an enumerable proto property, it could extend the native Object.prototype.

Published by the source

26 Apr 2019, 16:29 UTC

Last modified by the source

8 Jul 2026, 05:56 UTC

Source last checked

26 Oct 2026, 12:31 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-6c3j-c64m-qhgq

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-6c3j-c64m-qhgq

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# Patch Next advisory brief: CVE-2019-11358

Advisory: XSS in jQuery as used in Drupal, Backdrop CMS, and other products
IDs: CVE-2019-11358, GHSA-6c3j-c64m-qhgq
Record: https://patchnext.com/advisories/cve-2019-11358 (revision 2, 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 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: jquery 3.4.0; django 2.2.2, 2.1.9; jquery 3.4.0; org.webjars.npm:jquery 3.4.0; jquery-rails 4.3.4; maximebf/debugbar 1.19.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet jquery: affected >= 1.1.4, < 3.4.0; fixed in 3.4.0
- PyPI django: affected >= 2.0a1, < 2.1.9; >= 2.2a1, < 2.2.2; fixed in 2.2.2, 2.1.9
- npm jquery: affected >= 1.1.4, < 3.4.0; fixed in 3.4.0
- Maven org.webjars.npm:jquery: affected >= 1.1.4, < 3.4.0; fixed in 3.4.0
- RubyGems jquery-rails: affected < 4.3.4; fixed in 4.3.4
- Packagist maximebf/debugbar: affected < 1.19.0; fixed in 1.19.0

## Suggested inspection (read-only)
- NuGet jquery: check the installed version with your package manager.
- `python -m pip show django`: prints the installed version. Run with the environment that serves production active.
- `npm ls jquery --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- Maven org.webjars.npm:jquery: check the installed version with your package manager.
- RubyGems jquery-rails: check the installed version with your package manager.
- Packagist maximebf/debugbar: check the installed version with your package manager.

## 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 jquery, django, org.webjars.npm:jquery, jquery-rails, maximebf/debugbar.
- 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-6c3j-c64m-qhgq (OSV record GHSA-6c3j-c64m-qhgq lists affected ranges: npm jquery >=1.1.4 =0 =1.1.4 =2.0a1 =2.2a1 =1.1.4 =0 <1.19.0 (fixed))
- Verified: https://github.com/advisories/GHSA-6c3j-c64m-qhgq (GitHub-reviewed advisory GHSA-6c3j-c64m-qhgq lists affected ranges: RubyGems jquery-rails >=0 =2.0a1 =2.2a1 =1.1.4 =1.1.4 =1.1.4 =0 <1.19.0)

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