CVE-2026-55661
NoneCVSS
—
EPSS
0.4%
Published
Jul 1, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @tinacms/mdx | 0 | 2.1.7 |
| npm | tinacms | 0 | 3.9.3 |
Related vulnerabilities
- GHSA-2vcc-5v34-9jc8 TinaCMS rich-text (slatejson) rendering does not sanitize link/image URLs, allowing… Same vulnerability
- GHSA-g5qx-h5f3-mp2f TinaCMS: Cross-origin postMessage handlers and rich-text URL-sanitization bypass enable… Also affects tinacms
- GHSA-5hxf-c7j4-279c Tina: Path Traversal in Media Upload Handle Also affects tinacms
- CVE-2026-28791 Tina is a headless content management system. Also affects tinacms
- GHSA-529f-9qwm-9628 tinacms is vulnerable to arbitrary code execution Also affects tinacms
- CVE-2025-68278 Tina is a headless content management system. Also affects tinacms
- CVE-2026-96379 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
- CVE-2026-96382 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79