{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.1.18"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9c0a993d9fc2ffe9d56b013b030bc238f9c0557c"
            },
            {
              "fixed": "da8869922e19bc3f852091468d34029af80813e7"
            }
          ],
          "repo": "https://github.com/basecamp/trix",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-53g2-mvcc-q9x3"
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-73428",
  "modified": "2026-08-16T03:31:04.151948176Z",
  "published": "2026-08-13T22:04:19.121Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Trix: Stored XSS via HTMLParser attribute injection on paste"
}