Umbraco CMS Vulnerable to Stored XSS on Content Page Through Markdown Editor Preview Pane
Impact
Stored Cross-site scripting (XSS) enable attackers that have access to backoffice to bring malicious content into a website or application.
Affected versions
Umbraco CMS >= 8.00
Patches
This is fixed in 8.18.13, 10.8.4, 12.3.7, 13.1.1 by implementing IHtmlSanitizer
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | UmbracoCms.Core | >= 8.0.0, < 8.18.13, >= 10.0.0, < 10.8.4, >= 12.0.0, < 12.3.7, >= 13.0.0, < 13.1.1 | 8.18.13, 10.8.4, 12.3.7, 13.1.1 |
References
- https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-gvpc-3pj6-4m9w
- https://nvd.nist.gov/vuln/detail/CVE-2024-35218
- https://github.com/umbraco/Umbraco-CMS/commit/1b712fe6ec52aa4e71b3acf63e393c8e6ab85385
- https://github.com/umbraco/Umbraco-CMS/commit/a2684069b1e9976444f60b4b37a80be05b87f6b6
- https://github.com/umbraco/Umbraco-CMS/commit/cbf9f9bcd199d7ca0412be3071d275556f10b7ba
- https://github.com/umbraco/Umbraco-CMS/commit/d090176272d07500dac0daee7c598aa8bb321050
- https://github.com/umbraco/Umbraco-CMS
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-79- Platform
- .NET (NuGet)
- Package
UmbracoCms.Core- Disclosed
- 21.05.2024
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gvpc-3pj6-4m9w - CC BY 4.0
Vulnerability history: UmbracoCms.Core
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
- 5
- First → latest
- 05.2022 05.2024
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 4
Disclosures per year
- 2022: 3
- 2023: 0
- 2024: 2
- 2025: 0
- 2026: 0
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