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CVE Record

CVE-2019-11358: jQuery before 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}...

jQuery before 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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE affects old jQuery versions before 3.4.0. A flaw in deep object merging could let unsafe input change shared JavaScript object behavior. Business impact depends on where vulnerable jQuery is used and whether attacker-controlled data reaches the affected merge path.

Executive priority

Prioritize remediation where vulnerable jQuery is internet-facing, embedded in CMS platforms, or used in administrative interfaces. Treat as a legacy dependency risk with broad reach, not a confirmed active-exploitation emergency.

Technical view

jQuery.extend(true, {}, ...) mishandled enumerable __proto__ properties, enabling Object.prototype pollution. The CVE record names jQuery before 3.4.0 and downstream use in Drupal, Backdrop CMS, and other products. Consequences are application-specific and depend on vulnerable merge usage with unsanitized source objects.

Likely exposure

Exposure is likely in legacy web applications, CMS deployments, vendor appliances, packaged distributions, and bundled JavaScript assets that still include jQuery before 3.4.0.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation evidence. Public advisories and distribution updates show broad downstream remediation, but exploitability is context-dependent.

Researcher notes

The key validation question is data flow: can attacker-controlled enumerable properties reach a vulnerable deep merge call? The CVE metadata lacks CVSS and CWE details, so severity should be judged per application behavior.

Mitigation direction

  • Upgrade jQuery to 3.4.0 or later where directly managed.
  • Apply vendor security updates for Drupal, Debian, Synology, Airflow, and other affected packages.
  • Inventory bundled and transitive jQuery copies in web assets.
  • Avoid passing untrusted objects into deep jQuery.extend merge paths.
  • Check current vendor guidance for product-specific remediation.

Validation and detection

  • Confirm production bundles do not contain jQuery before 3.4.0.
  • Search application code for jQuery.extend(true, ...) using user-controlled objects.
  • Verify CMS, distro, and appliance versions include vendor fixes.
  • Review SBOM and dependency scans for embedded vulnerable jQuery.
  • Regression-test affected pages after replacing bundled jQuery.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2019-11358 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
32Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.