Stored XSS via SVG files in Umbraco CMS

1) Dangerous file upload

EUVDB-ID: #VU99234

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-48927

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability exists due to the application allows to upload SVG files to the server. A remote user can upload a specially crafted SVG file with an arbitrary JavaScript code inside and execute ti in the victim's browser in the security context of the website once the image is viewed.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Umbraco CMS: 10.1.0 - 13.5.1

CPE2.3

• cpe:2.3:a:umbraco:umbraco:13.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:12.3.10:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:11.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:umbraco:umbraco:10.8.6:*:*:*:*:*:*:*

External links

http://github.com/umbraco/Umbraco-CMS/releases/tag/release-13.5.2
http://github.com/umbraco/Umbraco-CMS/releases/tag/release-10.8.7
http://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-5955-cwv4-h7qh

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.