CVE-2019-11358
CWE-1321Published: April 20, 2019· Updated: Jun 17, 2026
Official Description
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.
Technical Analysis
CVE-2019-11358 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
A proof-of-concept (PoC) exploit exists for CVE-2019-11358. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (146)
Quick Facts
Related CVEs (CWE-1321)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-11358 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts