Potential Code Execution Risk When Viewing SVG Files in Full Screen in Backoffice

published 2024-10-22 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-2947 , GHSA-5955-cwv4-h7qh

cvss: 4.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

Umbraco, a free and open source .NET content management system, has a remote code execution issue in versions on the 13.x branch prior to 13.5.2, 10.x prior to 10.8.7, and 8.x prior to 8.18.15. There is a potential risk of code execution for Backoffice users when they “preview” SVG files in full screen mode. Versions 13.5.2, 10.8,7, and 8.18.15 contain a patch for the issue. As a workaround, derver-side file validation is available to strip script tags from file's content during the file upload process.

Patch / fix

fixed in 3

nuget UmbracoCms 8.18.15
nuget Umbraco.Cms 10.8.7, 13.5.2
umbraco umbraco_cms 8.18.15, 10.8.7, 13.5.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-10-22)

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
GitHub	3.1	4.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
NVD	3.1	4.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
nuget	UmbracoCms	>=8.0.0, <8.18.15	8.18.15
nuget	Umbraco.Cms	>=10.0.0, <10.8.7 >=13.0.0, <13.5.2	10.8.7 13.5.2

Affected products

umbraco Umbraco-CMS
umbraco umbraco_cms

Classification

Weakness

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /umbraco/Umbraco-CMS/security/advisories/GHSA-5955-cwv4-h7qh
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-48927
advisory
github.com /umbraco/Umbraco-CMS
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary