{"id":"EUVD-2026-41143","revision":null,"records":[{"revision":"43143c2764154dd79d56fb659c8d9ad4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55660","aliases":[],"title":"TinaCMS: Cross-origin postMessage handlers and rich-text URL-sanitization bypass enable stored XSS and session takeover","description":"Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session takeover. The library registers window message listeners — the useTina overlay handler, the OAuth authentication popup handler, and the admin↔preview iframe GraphQL reducer — that act on event.data without verifying event.origin or event.source and post messages using non-specific target origins, while insufficient URL sanitization in rich-text content allows malicious URLs to persist and execute. A page the victim visits (or a window in an opener/iframe relationship with a Tina admin) can forge messages to drive the editor, inject preview content, or observe/forge the OAuth popup channel to take over an authenticated editing session. This issue has been fixed in versions @tinacms/app 2.5.6 and tinacms 3.9.3.","state":0,"publishedAt":"2026-07-01T21:00:27.321+00:00","modifiedAt":"2026-07-02T12:43:47.881+00:00","affected":[{"ecosystem":"Vendor product","name":"tinacms","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"tinacms\",\n                    \"product\": \"tinacms\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.9.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"@tinacms/app","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"tinacms\",\n                    \"product\": \"@tinacms/app\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.5.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.6,"severity":"HIGH"}],"references":["https://github.com/tinacms/tinacms/security/advisories/GHSA-g5qx-h5f3-mp2f","https://github.com/tinacms/tinacms/pull/7056"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55660","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55660","identifiers":["CVE-2026-55660"]},"retained":false,"historicalAffected":[]},{"revision":"cac5a3eef450417c82f5b948970ce0d8","observedAt":"2026-11-15T15:52:14.302+00:00","statement":{"source":"euvd","id":"EUVD-2026-41143","aliases":["CVE-2026-55660","GHSA-g5qx-h5f3-mp2f"],"title":"Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session takeover. The library registers…","description":"Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session takeover. The library registers window message listeners — the useTina overlay handler, the OAuth authentication popup handler, and the admin↔preview iframe GraphQL reducer — that act on event.data without verifying event.origin or event.source and post messages using non-specific target origins, while insufficient URL sanitization in rich-text content allows malicious URLs to persist and execute. A page the victim visits (or a window in an opener/iframe relationship with a Tina admin) can forge messages to drive the editor, inject preview content, or observe/forge the OAuth popup channel to take over an authenticated editing session. This issue has been fixed in versions @tinacms/app 2.5.6 and tinacms 3.9.3.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.6,"severity":null}],"references":["https://github.com/tinacms/tinacms/security/advisories/GHSA-g5qx-h5f3-mp2f","https://github.com/tinacms/tinacms/pull/7056"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-41143","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 1, 2026, 9:00:27 PM","dateUpdated":"Jul 2, 2026, 12:43:47 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-41143","identifiers":["EUVD-2026-41143","CVE-2026-55660","GHSA-g5qx-h5f3-mp2f"]},"retained":false,"historicalAffected":[]},{"revision":"2a1a0c583b0447e7852c8a1e15224a33","observedAt":"2026-10-25T14:19:05.298+00:00","statement":{"source":"nvd","id":"CVE-2026-55660","aliases":[],"title":"Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session takeover. The library registers…","description":"Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session takeover. The library registers window message listeners — the useTina overlay handler, the OAuth authentication popup handler, and the admin↔preview iframe GraphQL reducer — that act on event.data without verifying event.origin or event.source and post messages using non-specific target origins, while insufficient URL sanitization in rich-text content allows malicious URLs to persist and execute. A page the victim visits (or a window in an opener/iframe relationship with a Tina admin) can forge messages to drive the editor, inject preview content, or observe/forge the OAuth popup channel to take over an authenticated editing session. This issue has been fixed in versions @tinacms/app 2.5.6 and tinacms 3.9.3.","state":0,"publishedAt":"2026-07-01T21:17:03.96+00:00","modifiedAt":"2026-07-02T17:45:00.78+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":7.6,"severity":"HIGH"}],"references":["https://github.com/tinacms/tinacms/pull/7056","https://github.com/tinacms/tinacms/security/advisories/GHSA-g5qx-h5f3-mp2f"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55660","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-79","CWE-346","CWE-601","CWE-940"],"productCriteria":[],"sourceDates":{"published":"2026-07-01T21:17:03.960","lastModified":"2026-07-02T17:45:00.780"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-55660","identifiers":["CVE-2026-55660"]},"retained":false,"historicalAffected":[]},{"revision":"9c3086fe402649e88244f34877607d23","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-g5qx-h5f3-mp2f","aliases":["CVE-2026-55660"],"title":"TinaCMS: Cross-origin postMessage handlers and rich-text URL-sanitization bypass enable stored XSS and session takeover","description":"TinaCMS registers window message listeners — the useTina overlay handler, the OAuth authentication popup handler, and the admin↔preview iframe GraphQL reducer — that act on event.data without verifying event.origin or event.source, and post messages using non-specific target origins. A page the victim visits (or a window in an opener/iframe relationship with a Tina admin) can forge messages to drive the editor, inject preview content, or observe/forge the OAuth popup channel to take over an authenticated editing session.\n\nFixed in [#7056](https://github.com/tinacms/tinacms/pull/7056) by allow-listing trusted origins and verifying event.source (isFromAdmin, isFromTrustedPreviewOrigin), and by posting only to explicit target origins (never \"*\").\n\nNote: the rich-text URL-sanitization issue previously bundled here has been split into its own advisory (GHSA-2vcc-5v34-9jc8) so each vulnerability can receive a distinct CVE.","state":0,"publishedAt":"2026-06-19T21:15:29+00:00","modifiedAt":"2026-09-10T03:50:49.4280183+00:00","affected":[{"ecosystem":"npm","name":"tinacms","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.9.3"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@tinacms/app","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.5.6"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/tinacms/tinacms/security/advisories/GHSA-g5qx-h5f3-mp2f","https://github.com/tinacms/tinacms/pull/7056","https://github.com/tinacms/tinacms"],"sourceUrl":"https://github.com/advisories/GHSA-g5qx-h5f3-mp2f","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-g5qx-h5f3-mp2f","identifiers":["GHSA-g5qx-h5f3-mp2f","CVE-2026-55660"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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