# CVE-2026-55661

## Summary

- **CVE ID:** CVE-2026-55661
- **Severity:** MEDIUM
- **CVSS Score:** 4.8 (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)
- **CWE:** CWE-79, CWE-87
- **Published:** Jul 1, 2026
- **Last Modified:** Jul 6, 2026

## Description

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 — tinacms (< 3.9.3)
- tinacms — @tinacms/mdx (< 2.1.7)

## References

- [CNA](https://github.com/tinacms/tinacms/security/advisories/GHSA-2vcc-5v34-9jc8)
- [CNA](https://github.com/tinacms/tinacms/pull/7056)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 34.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._