CVE-2026-55661
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk15th percentile — higher than 15% of all known CVEs
Summary
A stored XSS vulnerability exists in the Tina headless CMS rich-text component. The URL field in Slate link/image nodes is not sanitized, allowing malicious URLs (e.g., javascript: or data:text/html) to be rendered and executed when content is viewed.
Risk Assessment
An attacker with content editing privileges (or via imported/external content) can inject persistent malicious scripts that execute in the browsers of editors and site visitors, potentially leading to session theft, data compromise, or further attacks.
Recommendation
Immediately update @tinacms/mdx to version 2.1.7 or later and tinacms to version 3.9.3 or later. After updating, review all existing rich-text content for potential malicious entries.
Original NVD description (English source)
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.