{"id":"CVE-2026-73428","summary":"Trix: Stored XSS via HTMLParser attribute injection on paste","details":"Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to stored cross-site scripting when crafted HTML is pasted into the editor. HTMLParser processes a mock attachment in a `\u003cspan\u003e` with an empty `data-trix-attachment=\"{}\"` value, causing data-trix-attributes to be applied to a plain string piece. StringPiece.fromJSON accepts an unvalidated href, allowing a javascript: URI to enter the document model and serialized HTML and execute when another user renders and clicks the content. Applications that apply server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18.","aliases":["GHSA-53g2-mvcc-q9x3"],"modified":"2026-08-16T03:31:04.151948176Z","published":"2026-08-13T22:04:19.121Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73428.json"},"references":[{"type":"WEB","url":"https://github.com/basecamp/trix/releases/tag/v2.1.18"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73428.json"},{"type":"ADVISORY","url":"https://github.com/basecamp/trix/security/advisories/GHSA-53g2-mvcc-q9x3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73428"},{"type":"FIX","url":"https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c"},{"type":"FIX","url":"https://github.com/basecamp/trix/pull/1293"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/basecamp/trix","events":[{"introduced":"0"},{"fixed":"9c0a993d9fc2ffe9d56b013b030bc238f9c0557c"},{"fixed":"da8869922e19bc3f852091468d34029af80813e7"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.1.18"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.1.17","v2.1.16","v2.1.15","v2.1.14","v2.1.13","v2.1.12","v2.1.11","v2.1.10","v2.1.9","v2.1.8","v2.1.7","v2.1.6","v2.1.5","v2.1.4","2.1.3","v2.1.1","1.3.1","v2.1.0","v2.0.10","v2.0.9","v2.0.8","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","1.3.0","1.2.4","1.2.3","1.2.2","1.2.1","1.2.0","1.1.1","1.1.0","1.0.0","0.12.1","0.12.0","0.11.4","0.11.3","0.11.2","0.11.1","0.11.0","0.10.2","0.10.1","0.10.0","0.9.10","0.9.9","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.8.0","0.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73428.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"}]}