Trix: Stored XSS vulnerability through serialized attributes

{
  "id": "251a2489bf665c92218b790f8895882fdf51ddd650506bad19179fe529a98bbf",
  "url": "https://osv.dev/vulnerability/CVE-2026-73426",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Trix: Stored XSS vulnerability through serialized attributes",
    "summary": "Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.17, Trix is vulnerable to cross-site scripting when a data-trix-serialized-attributes attribute bypasses the DOMPurify sanitizer. An attacker can craft HTML containing a data-trix-serialized-attributes attribute with a malicious payload that, when rendered, executes arbitrary JavaScript in the user's session and may perform unauthorized actions or disclose sensitive information. This issue is fixed in version 2.1.17.",
    "evidence": "osv:CVE-2026-73426",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-73426",
      "aliases": [
        "CVE-2026-73426",
        "GHSA-qmpg-8xg6-ph5q"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/basecamp/trix",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2e46d5128f3927cd93543b5fff8d81b31d35ce77"
                },
                {
                  "fixed": "3229c29c771ded4d247ed79b2ccd2cd05c4e74b4"
                },
                {
                  "fixed": "53197ab5a142e6b0b76127cb790726b274eaf1bc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.1.17"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3229c29c771ded4d247ed79b2ccd2cd05c4e74b4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "53197ab5a142e6b0b76127cb790726b274eaf1bc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2e46d5128f3927cd93543b5fff8d81b31d35ce77"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.1.17"
                  }
                ]
              }
            }
          ],
          "versions": [
            "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-2026-73426.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.274380269Z",
      "provider": "osv",
      "references": [
        "https://github.com/basecamp/trix/releases/tag/v2.1.17",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73426.json",
        "https://github.com/basecamp/trix/security/advisories/GHSA-qmpg-8xg6-ph5q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73426",
        "https://github.com/basecamp/trix/commit/3229c29c771ded4d247ed79b2ccd2cd05c4e74b4",
        "https://github.com/basecamp/trix/commit/53197ab5a142e6b0b76127cb790726b274eaf1bc",
        "https://github.com/basecamp/trix/pull/1282"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73426.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73426",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492063,
  "published_at": "2026-08-18T14:24:27.542+00:00"
}