Umbraco Forms up to 13.4.1/15.1.1 escape output

Summaryinfo

A vulnerability marked as critical has been reported in Umbraco Forms up to 13.4.1/15.1.1. This affects an unknown part. Performing a manipulation results in escape output. This vulnerability is cataloged as CVE-2025-47280. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Umbraco Forms up to 13.4.1/15.1.1. This affects an unknown code. The manipulation with an unknown input leads to a escape output vulnerability. CWE is classifying the issue as CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Umbraco Forms is a form builder that integrates with the Umbraco content management system. Starting in the 7.x branch and prior to versions 13.4.2 and 15.1.2, the 'Send email' workflow does not HTML encode the user-provided field values in the sent email message, making any form with this workflow configured vulnerable, as it allows sending the message from a trusted system and address, potentially bypassing spam and email client security systems. This issue affects all (supported) versions Umbraco Forms and is patched in 13.4.2 and 15.1.2. Unpatched or unsupported versions can workaround this issue by using the `Send email with template (Razor)` workflow instead or writing a custom workflow type. To avoid accidentally using the vulnerable workflow again, the `SendEmail` workflow type can be removed using a composer available in the GitHub Security Advisory for this vulnerability.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-47280 since 05/05/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 13.4.2 or 15.1.2 eliminates this vulnerability.

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Productinfo

Vendor

• Umbraco

Name

• Forms

Version

• 13.4.0
• 13.4.1
• 15.1.0
• 15.1.1

CPE 2.3info

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CPE 2.2info

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