Blind SSRF Leads to Port Scan by using Webhooks
Impact
Failing webhooks logs are available when solution is not in debug mode. Those logs can contain information that is critical.
Affected Versions
Umbraco versions 13.0.0 - 13.1.1
Patches
13.1.1
Workarounds
Disabling webhooks functionality.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.Cms.Core | >= 13.0.0, < 13.1.1 | 13.1.1 |
| .NET (NuGet) | Umbraco.Cms.Web.BackOffice | >= 13.0.0, < 13.1.1 | 13.1.1 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N- Weakness (CWE)
CWE-918- Platform
- .NET (NuGet)
- Package
Umbraco.Cms.Core, Umbraco.Cms.Web.BackOffice- Disclosed
- 17.04.2024
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-74p6-39f2-23v3 - CC BY 4.0
Vulnerability history: Umbraco.Cms.Web.BackOffice
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
- 07.2023 03.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 3
Disclosures per year
- 2023: 1
- 2024: 2
- 2025: 1
- 2026: 0
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