Vulnerability identifier: #VU36272

Vulnerability risk: Low

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-20418

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Craft CMS
Web applications / CMS

Vendor: Pixel & Tonic, Inc.

Description

The disclosed 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 "index.php?p=admin/actions/entries/save-entry" when saving a new title from the console tab. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website .

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

Craft CMS: 3.0.25

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External links
http://github.com/craftcms/cms/blob/master/CHANGELOG-v3.md
http://github.com/rdincel1/Craft-CMS-3.0.25---Cross-Site-Scripting
http://www.exploit-db.com/exploits/46054/
http://www.raifberkaydincel.com/craft-cms-3-0-25-cross-site-scripting-vulnerability.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user 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.