ubuntu-cve-2020-26870
Vulnerability from osv_ubuntu
Published
2020-10-07 16:15
Modified
2025-10-24 04:48
Summary
Details

Cure53 DOMPurify before 2.0.17 allows mutation XSS. This occurs because a serialize-parse roundtrip does not necessarily return the original DOM tree, and a namespace can change from HTML to MathML, as demonstrated by nesting of FORM elements.

Severity
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-dompurify",
            "binary_version": "0.7.3~dfsg1-2"
          },
          {
            "binary_name": "node-dompurify",
            "binary_version": "0.7.3~dfsg1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "dompurify.js",
        "purl": "pkg:deb/ubuntu/dompurify.js@0.7.3~dfsg1-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.3~dfsg1-1",
        "0.7.3~dfsg1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-dompurify",
            "binary_version": "0.9.0~dfsg1-2"
          },
          {
            "binary_name": "node-dompurify",
            "binary_version": "0.9.0~dfsg1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dompurify.js",
        "purl": "pkg:deb/ubuntu/dompurify.js@0.9.0~dfsg1-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.0~dfsg1-1",
        "0.9.0~dfsg1-2"
      ]
    }
  ],
  "aliases": [],
  "details": "Cure53 DOMPurify before 2.0.17 allows mutation XSS. This occurs because a serialize-parse roundtrip does not necessarily return the original DOM tree, and a namespace can change from HTML to MathML, as demonstrated by nesting of FORM elements.",
  "id": "UBUNTU-CVE-2020-26870",
  "modified": "2025-10-24T04:48:49Z",
  "published": "2020-10-07T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-26870"
    },
    {
      "type": "REPORT",
      "url": "https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-26870"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-26870"
  ]
}



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Detection rules are retrieved from Rulezet.