#VU73794 Stored cross-site scripting in Craft CMS

Vulnerability identifier: #VU73794

Vulnerability risk: Low

CVSSv4.0: [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2023-23927

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

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 in the quick post widget on the admin dashboard. A remote attacker can inject 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 updates from vendor's website.

Vulnerable software versions

Craft CMS: 4.3.6.1

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External links
http://github.com/craftcms/cms/security/advisories/GHSA-qcrj-6ffc-v7hq
http://github.com/craftcms/cms/blob/develop/CHANGELOG.md#437---2023-02-03
http://user-images.githubusercontent.com/53917092/215604129-d5b75608-5a24-4eb3-906f-55b192310298.mp4

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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.