Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Umbraco.Cms versions 14.0.0 up to but not including 16.5.1, and 17.0.0 up to but not including 17.2.2, are affected. An authenticated backoffice user can assign domains to content nodes they lack permission to edit, which can alter routing and possibly expose configuration information. Upgrade to 16.5.1 or 17.2.2; the source lists no workaround other than upgrading.
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 |
|---|---|---|---|---|
| 5.4 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0021, the 11th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 10 Mar 2026, 05:31 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