MEDIUM5.4

GHSA-95qr-67rx-9pgh

Umbraco CMS vulnerable to stored XSS

Details

A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor, as TinyMCE is configured to allow iframes by default in Umbraco CMS.

Are you affected?

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Affected packages

NuGet/UmbracoCms.Core

Introduced in: 0

No fixed version published yet for UmbracoCms.Core (nuget). Pin to a known-safe version or switch to an alternative.

References

https://nvd.nist.gov/vuln/detail/CVE-2020-5809[ADVISORY]
https://github.com/umbraco/Umbraco-CMS[PACKAGE]
https://www.tenable.com/security/research/tra-2020-59[WEB]