Stored XSS via SVG files in Umbraco CMS

1) Arbitrary file upload

EUVDB-ID: #VU84111

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

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.