CVE-2026-31834

HIGH

7.2

Description

Umbraco is an ASP.NET CMS. From 15.3.1 to before 16.5.1 and 17.2.2, A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient authorization enforcement when modifying user group memberships. The affected functionality does not properly validate whether a user has sufficient privileges to assign highly privileged roles. This vulnerability is fixed in 16.5.1 and 17.2.2.

CVE Details

CVSS v3.1 Score7.2

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionNONE

Published3/10/2026

Last Modified3/18/2026

Sourcenvd

Honeypot Sightings0

Affected Products

umbraco:umbraco_cms

Weaknesses (CWE)

CWE-269CWE-284CWE-862

References

https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-rhcg-3h8r-v6vp(security-advisories@github.com)

IOC Correlations

No correlations recorded

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