What is CVE-2023-48313?

CVE-2023-48313 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2023-12-12.

How severe is CVE-2023-48313?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Umbraco Umbraco-Cms

CVE-2023-48313

Umbraco is an ASP.NET content management system (CMS). Starting in 10.0.0 and prior to versions 10.8.1 and 12.3.4, Umbraco contains a cross-site scripting (XSS) vulnerability enabling attackers to bring malicious content into a website or application. Versions 10.8.1 and 12.3.4 contain a patch for this issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-12-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Umbraco Umbraco-Cms — versions >= 10.0.0, < 10.8.1, >= 11.0.0-rc1, < 12.3.4
Umbraco Cms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-v98m-398x-269r (Vendor Advisory)

Frequently asked questions

What is CVE-2023-48313?: CVE-2023-48313 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2023-12-12.
How severe is CVE-2023-48313?: Medium severity. CVSS v3 base score is 4.3 out of 10.