Is CVE-2026-31834 actively exploited?

No active exploitation of CVE-2026-31834 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-31834 be exploited remotely?

Yes. CVE-2026-31834 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-31834?

CVE-2026-31834 has a CVSS score of 7.2 (HIGH).

HOME VULNERABILITIESCVE-2026-31834

HIGH

CVE-2026-31834

CWE-269Published: March 10, 2026· Updated: Mar 11, 2026

7.2

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-31834 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.