DOM-XSS on Backoffice login screen.
Impact
Cross-site scripting (XSS) enable attackers to bring malicious content into a website or application.
Explanation of the vulnerability
A DOM-XSS can be exploited when users are successfully logging into the Backoffice.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.CMS | >= 10.0.0, < 10.8.1, >= 11.0.0, < 12.3.4 | 10.8.1, 12.3.4 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- .NET (NuGet)
- Package
Umbraco.CMS- Disclosed
- 13.12.2023
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-v98m-398x-269r - 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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DOM-XSS on Backoffice login screen. this entry
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