HTML injection in Umbraco CMS

1) Cross-site scripting

EUVDB-ID: #VU84097

Risk: Low

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

CVE-ID: CVE-2023-38694

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

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

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote user with access to a specific part of the backoffice can permanently inject and execute arbitrary HTML 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

Umbraco CMS: 8.0.0 - 12.0.1

CPE2.3

• cpe:2.3:a:umbraco:umbraco:8.18.9:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:9.5.4:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:10.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:11.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:12.0.1:*:*:*:*:*:*:*

External links

http://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-xxc6-35r7-796w

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.