What is CVE-2025-27602?

CVE-2025-27602 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under Improper Authorization. CVSS score: 4.9/10. Published 2025-03-11.

How severe is CVE-2025-27602?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Auth bypass in Umbraco Umbraco-Cms

CVE-2025-27602

Umbraco is a free and open source .NET content management system. In versions of Umbraco's web backoffice program prior to versions 10.8.9 and 13.7.1, via manipulation of backoffice API URLs, it's possible for authenticated backoffice users to retrieve or delete content or media held within folders the editor does not have access to. The issue is patched in versions 10.8.9 and 13.7.1. No known workarounds are available.

Published 2025-03-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.0th percentile), scored 2026-11-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Umbraco Umbraco-Cms — versions < 10.8.9, >= 11.0.0-rc1, < 13.7.1
Umbraco Cms

Weakness classification (CWE)

References

github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-wx5h-wqfq-v698 (Patch, Third Party Advisory)
github.com/umbraco/Umbraco-CMS/commit/5b54bed406682ceff57903bf7d3c57814eef31a7 (Patch)
github.com/umbraco/Umbraco-CMS/commit/7888b9a4ce5ae7f9bda7ff3bb705b8fcd2f1675d (Patch)

Frequently asked questions

What is CVE-2025-27602?: CVE-2025-27602 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under Improper Authorization. CVSS score: 4.9/10. Published 2025-03-11.
How severe is CVE-2025-27602?: Medium severity. CVSS v3 base score is 4.9 out of 10.