CVE-2026-55661
CVE-2026-55661 · TinaCMS rich-text (slatejson) rendering does not sanitize link/image URLs, allowing stored XSS via dangerous URL schemes
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Tina is a headless content management system. In versions prior to @tinacms/mdx 2.1.7 and tinacms 3.9.3, 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. This issue is fixed in versions @tinacms/mdx 2.1.7 and tinacms 3.9.3.
CVSS 4.8 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
tinacms
- Versions
- < 3.9.3: Affected
No fix published
@tinacms/mdx
- Versions
- < 2.1.7: Affected
No fix published
tinacms npm
- Affected ranges
- SEMVER: < 3.9.3
Update to 3.9.3
@tinacms/mdx npm
- Affected ranges
- SEMVER: < 2.1.7
Update to 2.1.7