jQuery prototype pollution in Backdrop CMS

Published: 2019-04-22
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-11358
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Backdrop CMS
Web applications / CMS

Vendor Backdrop CMS

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Prototype pollution

EUVDB-ID: #VU18092

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-11358

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('Resource Exhaustion')

Exploit availability: Yes


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to prototype pollution. A remote attacker can trick the extend function can into modifying the prototype of Object when the attacker controls part of the structure passed to this function. This can let an attacker add or modify an existing property that will then exist on all objects and perform a denial of service (DoS) attack.


Update to version 1.12.6 or 1.11.9.

Vulnerable software versions

Backdrop CMS: 1.11.0 - 1.11.8, 1.12.0 - 1.12.5

CPE2.3 External links


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.