Vulnerability identifier: #VU20805

Vulnerability risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-11886

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Visual CSS Style Editor
Web applications / Modules and components for CMS

Vendor: WaspThemes

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in yellow-pencil.php. A remote non-authenticated attacker can perform options update and compromise the website via vulnerable plugin.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Visual CSS Style Editor: 7.1.5 - 7.2.0

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External links
http://www.wordfence.com/blog/2019/04/zero-day-vulnerability-in-yellow-pencil-visual-theme-customiz...
http://blog.nintechnet.com/zero-day-vulnerability-in-wordpress-visual-css-style-editor-plugin-activ...

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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.