CVE-2025-24012Network attack vector

Backoffice script execution via unescaped localization arguments

Published Jan 21, 2025 · Updated Feb 12, 2025

Cross-site scripting in affected Umbraco CMS 14 and 15 releases allows remote authenticated users to execute script in the backoffice. UmbLocalizationController.term inserts user-controlled localization arguments into translated HTML without first escaping HTML entities. Exploitation requires backoffice access and another user to view an affected localized component, allowing script to read or modify data available to that browser session.

CVSS severity4.6
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in affected Umbraco CMS 14 and 15 releases allows remote authenticated users to execute script in the backoffice. UmbLocalizationController.term inserts user-controlled localization arguments into translated HTML without first escaping HTML entities. Exploitation requires backoffice access and another user to view an affected localized component, allowing script to read or modify data available to that browser session.

The record

CVE
CVE-2025-24012
Published
Jan 21, 2025
Updated
Feb 12, 2025
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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=>= 14.0.0, < 14.3.2
  2. Affected versionversion=>= 15.0.0, < 15.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Umbraco · Umbraco CMSversion=>= 14.0.0, < 14.3.2; version=>= 15.0.0, < 15.1.2

Published CVSS scores

4.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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