Synopsis
A researcher at Tenable discovered a post-authentication stored cross-site scripting (XSS) vulnerability in Craft CMS core.
When creating a new field it is possible to inject html, including script tags, and inject an XSS payload which will be executed by users accessing the “Categories” and “Entries” pages.
Proof of Concept:
1. Create a new field with a name such as <script>alert(document.domain)</script>
2. Create a new category or section and add the field created in step 1.
3. The payload will be executed when accessing the Categories or Entries pages, respectively.
Solution
Craft CMS has fixed this issue in github commit https://github.com/craftcms/
Additional References
https://github.com/craftcms/cms/commit/7655e1009ba6cdbfb230e6bb138b775b69fc7bcbDisclosure Timeline
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