SMTP misconfiguration leading to "Forgot Password" exploit that leaks registered user email.
Impact
A user enumeration attack is possible when SMTP is not setup correctly, but reset password is enabled
Explanation of the vulnerability
Two different error messages was shown, based on if the user exists or not when using the forgot password functionality, when the SMTP was configured but do not response.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.CMS | >= 8.0.0, < 8.18.10, >= 9.0.0, < 10.8.1, >= 11.0.0, < 12.3.4 | 8.18.10, 10.8.1, 12.3.4 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-200- Platform
- .NET (NuGet)
- Package
Umbraco.CMS- Disclosed
- 13.12.2023
- Updated
- 11.10.2026 11:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8qp8-9rpw-j46c - CC BY 4.0
Vulnerability history: Umbraco.CMS
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
- 29
- First → latest
- 05.2022 09.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 17
- Low 7
Disclosures per year
- 2022: 2
- 2023: 8
- 2024: 5
- 2025: 8
- 2026: 6
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SMTP misconfiguration leading to "Forgot Password" exploit that leaks registered user email. this entry
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