CVE-2026-55661

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.

Affected products

@Tinacms/Mdx, Tinacms

Fix

Available

CVSS 4.0

4.8 MEDIUM

EPSS

0.2% (15th percentile)

Weakness

CWE-87, CWE-79

NVD status

Deferred

Published

2026-07-01

No exploit for CVE-2026-55661 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.