Umbraco.Forms has HTML injection vulnerability in 'Send email' workflow
Impact
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).
Patches
This issue affects all (supported) versions Umbraco Forms and is patched in 13.4.2 and 15.1.2.
Workarounds
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 the following composer (tested on Umbraco 10, 13, 14 and 15):
using Umbraco.Cms.Core.Composing;
using Umbraco.Forms.Core.Providers.Extensions;
using Umbraco.Forms.Core.Providers.WorkflowTypes;
internal sealed class RemoveFormsSendEmailWorkflowTypeComposer : IComposer
{
public void Compose(IUmbracoBuilder builder)
=> builder.FormsWorkflows().Exclude<SendEmail>();
}Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.Forms | >= 7.0.0, < 13.4.2, >= 14.0.0, < 15.1.2 | 13.4.2, 15.1.2 |
| .NET (NuGet) | UmbracoForms | >= 7.0.0, <= 8.13.16 | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:N- Weakness (CWE)
CWE-116- Platform
- .NET (NuGet)
- Package
Umbraco.Forms, UmbracoForms- Disclosed
- 13.05.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2qrj-g9hq-chph - CC BY 4.0
Vulnerability history: UmbracoForms
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 07.2020 01.2026
- Without a fix
- 3
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 1
- Medium 1
- Low 1
Disclosures per year
- 2020: 1
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 1
-
Umbraco.Forms has HTML injection vulnerability in 'Send email' workflow this entry
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