CVE-2025-27601Network attack vector

Low-privilege data-type modification via missing endpoint policies

Published Mar 11, 2025 · Updated Mar 11, 2025

Improper authorization in Umbraco CMS before 14.3.3 and 15.0.0-rc1 through 15.2.2 allows remote authenticated users to alter data types. The DataType create and update management controllers lacked the TreeAccessDataTypes authorization policy, so authenticated requests reached restricted operations. Any backoffice account with API access, even without Settings-section permission, can change data-type definitions and alter CMS configuration integrity.

CVSS severity4.3
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Umbraco CMS before 14.3.3 and 15.0.0-rc1 through 15.2.2 allows remote authenticated users to alter data types. The DataType create and update management controllers lacked the TreeAccessDataTypes authorization policy, so authenticated requests reached restricted operations. Any backoffice account with API access, even without Settings-section permission, can change data-type definitions and alter CMS configuration integrity.

The record

CVE
CVE-2025-27601
Published
Mar 11, 2025
Updated
Mar 11, 2025
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-285, CWE-863, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2025Record 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=< 14.3.3
  2. Affected versionversion=>= 15.0.0-rc1, < 15.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Umbraco · Umbraco CMSversion=< 14.3.3; version=>= 15.0.0-rc1, < 15.2.3

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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-285Improper Authorization
CWE-863Incorrect Authorization
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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