Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Umbraco.Cms.Web.Backoffice versions before 10.8.9 and from 11.0.0-rc1 before 13.7.1 are affected. An authenticated backoffice user with editor access can manipulate backoffice API URLs to retrieve or delete content or media in folders they are not permitted to access. Upgrade to 10.8.9 or 13.7.1. The source lists no workarounds.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 4.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0030, the 23rd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 11 Mar 2025, 07:43 UTC Published by the maintainers as a GitHub repository advisory
- 31 Oct 2026, 15:22 UTC First seen by agentprime
- 31 Oct 2026, 15:22 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-wx5h-wqfq-v698
- OSV: GHSA-wx5h-wqfq-v698
- github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-wx5h-wqfq-v698
- nvd.nist.gov/vuln/detail/CVE-2025-27602
- github.com/umbraco/Umbraco-CMS/commit/5b54bed406682ceff57903bf7d3c57814eef31a7
- github.com/umbraco/Umbraco-CMS/commit/7888b9a4ce5ae7f9bda7ff3bb705b8fcd2f1675d
- github.com/umbraco/Umbraco-CMS