Medium severity · published Mar 10, 2026
CVE-2026-31832
Umbraco Backoffice API Allows Unauthorized Modification of Domain Data
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by insufficient authorization enforcement on the affected API endpoint, whereby via an API call, domains can be set on content nodes that the editor does not have permission to access (either via user group privileges or start nodes). This vulnerability is fixed in 16.5.1 and 17.2.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UM
Umbraco-CMS · umbraco
>= 14.0.0, < 16.5.1; >= 17.0.0, < 17.2.0 · source: vendor
UC
Umbraco Cms · Umbraco
14.0.0 before 16.5.1; 17.0.0 before 17.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31832
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31832
Vendor Advisory
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fpvf-fvp5-996r
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