Security advisory

{
  "id": "7b6745e33817357399af697052a87a43c162f1222c3bf6efab1808e4c9a3e0ad",
  "url": "https://osv.dev/vulnerability/CVE-2020-6816",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-6816",
    "summary": "In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.",
    "evidence": "osv:CVE-2020-6816",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-6816",
      "aliases": [
        "CVE-2020-6816",
        "GHSA-m6xf-fq7q-8743",
        "PYSEC-2020-28"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mozilla/bleach",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "78a06726dd6c72a42c90c1f7a8fa5d21ebcfa587"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.1.1",
            "v3.1.0",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1",
            "v2.0",
            "v1.5",
            "v1.4.2",
            "v1.4.1",
            "v1.4",
            "v1.2.2",
            "v1.2.1",
            "v1.1.1",
            "v1.1.0",
            "v1.0.4",
            "1.0.3",
            "1.0.2",
            "1.0.1",
            "1.0.0",
            "1.0.0rc2",
            "0.5.0",
            "1.0.0rc",
            "0.4.0",
            "0.3.5",
            "0.3.4",
            "0.3.3",
            "0.3.2",
            "0.3.1",
            "0.3.0",
            "0.2.2",
            "0.2.1",
            "0.2.0",
            "0.1.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-6816.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:29.593166215Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/",
        "https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743",
        "https://advisory.checkmarx.net/advisory/CX-2020-4277",
        "https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-6816",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384362,
  "published_at": "2020-03-24T22:15:12.657+00:00"
}