@tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSS

Why it is Yellow

• CVSS 7.6 high
• On your watchlist: npm

Affected packages

References

• https://github.com/advisories/GHSA-c42q-qvc3-j6vg
• https://github.com/tinacms/tinacms/security/advisories/GHSA-c42q-qvc3-j6vg
• https://github.com/tinacms/tinacms/pull/7523
• https://github.com/tinacms/tinacms/commit/5295e077f0d279c35686a0e481a15e33a4877e3b
• https://github.com/tinacms/tinacms/releases/tag/@tinacms/web-components@0.2.1
• https://github.com/advisories/GHSA-c42q-qvc3-j6vg

Original description

Tina is a headless content management system. Prior to 0.2.1, the tina-markdown element in packages/@tinacms/web-components/src/tina-markdown.js assigns a rich-text node.url value directly to an anchor href without validating the URL scheme. A content author can store a link using a script-capable scheme, and a visitor who clicks the rendered link executes attacker-controlled script in the site's origin. The script can access same-origin application data and, when the visitor is an editor or administrator, may expose credentials stored by the TinaCMS admin on that origin. This issue is fixed in version 0.2.1.