Stored XSS via SVG files in Umbraco CMS

1) Arbitrary file upload

EUVDB-ID: #VU84111

Risk: Medium

CVSSv4.0: 1.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-49279

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote user to perform XSS attack.

The vulnerability exists due to the application allows upload of SVG files with JavaScript code inside. A remote user can upload a specially crafted SVG file and perform XSS attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Umbraco CMS: 7.0.0 - 12.1.2

CPE2.3

• cpe:2.3:a:umbraco:umbraco:7.15.9:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:8.18.8:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:9.5.4:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:10.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:11.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:12.1.2:*:*:*:*:*:*:*

External links

http://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-6xmx-85x3-4cv2

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.