{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1135516a1a4a8f9638641c460488a43d8af20081"
            },
            {
              "fixed": "38ff1106c8176b16c2da9872acd9b449adcbb949"
            }
          ],
          "repo": "https://github.com/apostrophecms/apostrophe",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g8qq-57p8-ggw5"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84371.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.9.0"
          },
          {
            "fixed": "2.17.7"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From version 1.9.0 until version 2.17.7, packages/sanitize-html/index.js validates an animation value attribute as one flat URL and does not recognize that attributeName selecting href or xlink:href gives the sibling values, from, to, or by attribute SVG SMIL URL semantics. In configurations that allow the animate, animateColor, animateMotion, animateTransform, or set elements, a values list can begin with a safe fragment and contain a later executable destination that survives allowedSchemesAppliedToAttributes checking. When the sanitized SVG is rendered, the browser can copy that later destination into the live link, and a victim who activates the link can execute script in the application's origin. This issue is fixed in version 2.17.7.",
  "id": "CVE-2026-84371",
  "modified": "2026-09-04T03:30:17.103040314Z",
  "published": "2026-09-01T20:51:10.441Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/apostrophecms/apostrophe/blob/main/packages/sanitize-html/CHANGELOG.md"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84371.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-g8qq-57p8-ggw5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84371"
    },
    {
      "type": "FIX",
      "url": "https://github.com/apostrophecms/apostrophe/commit/1135516a1a4a8f9638641c460488a43d8af20081"
    },
    {
      "type": "FIX",
      "url": "https://github.com/apostrophecms/apostrophe/commit/38ff1106c8176b16c2da9872acd9b449adcbb949"
    },
    {
      "type": "FIX",
      "url": "https://github.com/apostrophecms/apostrophe/pull/5552"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass"
}