CVE-2026-31834
Last modified
CVE-2026-31834 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 0.26% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Umbraco | Umbraco Cms | >= 15.3.1, < 16.5.1 |
| Umbraco | Umbraco Cms | >= 17.0.0, < 17.2.2 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
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