What is CVE-2023-49273?

CVE-2023-49273 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2023-12-12.

How severe is CVE-2023-49273?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Umbraco Umbraco-Cms

CVE-2023-49273

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (30.8th percentile), scored 2026-11-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.8% 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 >= 8.0.0, < 8.18.10, >= 9.0.0-rc001, < 10.8.1, >= 11.0.0-rc1, < 12.3.4
Umbraco Cms

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-cfr5-7p54-4qg8 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-49273?: CVE-2023-49273 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2023-12-12.
How severe is CVE-2023-49273?: Medium severity. CVSS v3 base score is 5.4 out of 10.