CVE-2026-31832Network attack vector

Authenticated domain configuration modification via missing authorization

Published Mar 10, 2026 · Updated Mar 10, 2026

Broken object authorization in Umbraco CMS 14.0.0 through 16.5.0 and 17.0.0 through 17.2.1 allows remote authenticated users to alter domain data. The backoffice API endpoint assigns domain configuration to a requested content node without enforcing the caller's group privileges or start-node access. Backoffice access is required; exploitation can alter content routing or interrupt service, with no direct content disclosure reported.

CVSS severity5.4
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken object authorization in Umbraco CMS 14.0.0 through 16.5.0 and 17.0.0 through 17.2.1 allows remote authenticated users to alter domain data. The backoffice API endpoint assigns domain configuration to a requested content node without enforcing the caller's group privileges or start-node access. Backoffice access is required; exploitation can alter content routing or interrupt service, with no direct content disclosure reported.

The record

CVE
CVE-2026-31832
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 14.0.0, < 16.5.1
  2. Affected versionversion=>= 17.0.0, < 17.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Umbraco · Umbraco CMSversion=>= 14.0.0, < 16.5.1; version=>= 17.0.0, < 17.2.0

Published CVSS scores

5.4GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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