Vulnerability identifier: #VU18517

Vulnerability risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-9864

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WP Live Chat Support
Web applications / Modules and components for CMS

Vendor: WP-LiveChat

Description

The vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via the Name field. A remote attacker can permanently store and execute arbitrary HTML and script code in user's browser in context of vulnerable website, when chat history is viewed by website administrators.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

WP Live Chat Support: 1.0 - 8.0.05

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External links
http://wordpress.org/plugins/wp-live-chat-support/#developers
http://www.gubello.me/blog/wp-live-chat-support-8-0-05-stored-xss/
http://www.youtube.com/watch?v=eHG1pWaez9w

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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.