CVE-2026-55661
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| tinacms | tinacms | < 3.9.3 | affected |
| tinacms | @tinacms/mdx | < 2.1.7 | affected |
Weaknesses
- CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CWE-87: CWE-87: Improper Neutralization of Alternate XSS Syntax
References
- https://github.com/tinacms/tinacms/security/advisories/GHSA-2vcc-5v34-9jc8
- https://github.com/tinacms/tinacms/pull/7056
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