TinaCMS rich-text parsing and the default link/image renderers did not sanitize the "url" field on Slate link/image nodes. Content containing "javascript:" or "data:text/html" URLs — including case-variant, whitespace-padded, and control-character-obfuscated forms — is rendered into "href"/"src" and executes when the content is viewed. Any actor able to author rich-text content (for example a lower-privileged editor, or imported/external content) can achieve stored XSS against editors and site viewers. Fixed in https://github.com/tinacms/tinacms/pull/7056 via a "sanitizeUrl()" helper (case-insensitive, whitespace/control-character-normalized scheme allow-list) applied recursively to Slate trees at parse time and in the default rich-text rendering.