GHSA-cjmm-f4jc-qw8r.json

{
  "schema_version": "1.4.0",
  "id": "GHSA-cjmm-f4jc-qw8r",
  "modified": "2026-04-03T03:46:08Z",
  "published": "2026-04-03T03:46:07Z",
  "aliases": [],
  "summary": "DOMPurify ADD_ATTR predicate skips URI validation",
  "details": "## Summary\nDOMPurify allows `ADD_ATTR` to be provided as a predicate function via `EXTRA_ELEMENT_HANDLING.attributeCheck`. When the predicate returns `true`, `_isValidAttribute` short-circuits the attribute check before URI-safe validation runs. An attacker who supplies a predicate that accepts specific attribute/tag combinations can then sanitize input such as `<a href=\"javascript:alert(document.domain)\">` and have the `javascript:` URL survive, because URI validation is skipped for that attribute while other checks still pass. The provided PoC accepts `href` for anchors and then triggers a click inside an iframe, showing that the sanitized payload executes despite the protocol bypass.\n\n## Impact\nPredicate-based allowlisting bypasses DOMPurify's URI validation, allowing unsafe protocols such as `javascript:` to reach the DOM and execute whenever the link is activated, resulting in DOM-based XSS.\n\n## Credits\nIdentified by Cantina’s Apex (https://www.cantina.security).",
  "severity": [
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "dompurify"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.9, 3.3.2"
            }
          ]
        }
      ],
      "database_specific": {
        "last_known_affected_version_range": "<= 3.3.1"
      }
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-cjmm-f4jc-qw8r"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cure53/DOMPurify"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cure53/DOMPurify/releases/tag/3.3.2"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-183"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-03T03:46:07Z",
    "nvd_published_at": null
  }
}