CVE-2026-31834 identifies a privilege escalation vulnerability in Umbraco CMS, affecting versions 15.3.1 to before 16.5.1 and 17.2.2. The flaw allows authenticated backoffice users with user management permissions to elevate their privileges by assigning highly privileged roles due to insufficient authorization enforcement. This vulnerability carries a CVSS score of 7.2 (HIGH), indicating a network-exploitable issue with low attack complexity and high impact on confidentiality, integrity, and availability. While requiring high privileges, it poses a significant risk if exploited. Currently, there is no evidence of active exploitation, public exploit code, or notable community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 15.3.1, < 16.5.1CPE matchmatch criteria | cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* | ||
>= 17.0.0, < 17.2.2CPE matchmatch criteria | cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.