{"cve":"CVE-2026-55661","nvd":{"published":"2026-07-01T21:17:04.090","modified":"2026-07-06T16:16:34.977","status":"Deferred","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.","cvss_v4":{"vector":"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","score":4.8},"cvss_v3":null,"cwes":["CWE-79","CWE-87"],"references":["https://github.com/tinacms/tinacms/pull/7056","https://github.com/tinacms/tinacms/security/advisories/GHSA-2vcc-5v34-9jc8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:42:16.820116992+00:00"},"epss":{"cve":"CVE-2026-55661","score":0.00405,"percentile":0.34771,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2vcc-5v34-9jc8","url":"https://osv.dev/vulnerability/GHSA-2vcc-5v34-9jc8","summary":"TinaCMS rich-text (slatejson) rendering does not sanitize link/image URLs, allowing stored XSS via dangerous URL schemes","modified":"2026-09-10T03:50:55.365499184Z","packages":[{"ecosystem":"npm","name":"tinacms","purl":"pkg:npm/tinacms","ranges":["<3.9.3"],"fixed":["3.9.3"]},{"ecosystem":"npm","name":"@tinacms/mdx","purl":"pkg:npm/%40tinacms/mdx","ranges":["<2.1.7"],"fixed":["2.1.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}