Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTML

{
  "id": "154ebc9126fe836dcade71576ae26f3ff5a80f24274ba21359e081f196a301af",
  "url": "https://osv.dev/vulnerability/CVE-2026-111059",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTML",
    "summary": "Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. From 3.0.0 until 3.2.11, mr.Markdown converts attacker-controlled Markdown to HTML without sanitizing raw HTML before assigning it to an ipywidgets.HTML sink. Event-handler attributes and other active HTML can therefore reach the DOM and execute when another user views the application. This issue is fixed in version 3.2.11.",
    "evidence": "osv:CVE-2026-111059",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-111059",
      "aliases": [
        "CVE-2026-111059",
        "GHSA-2658-85cv-9wwq"
      ],
      "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/mljar/mercury",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d6921dd842d5835d43a7558c5a4ddbcff8b5e540"
                },
                {
                  "fixed": "944c6b7ada1d6525d43dae2b895be68747906ca1"
                },
                {
                  "fixed": "c798a85924e6614c6fea7afe5a560e4554a1d09b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.2.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c798a85924e6614c6fea7afe5a560e4554a1d09b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "944c6b7ada1d6525d43dae2b895be68747906ca1"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.2.11"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.2.10",
            "v3.2.9",
            "v3.2.8",
            "v3.2.7",
            "v3.2.5",
            "3.2.6",
            "v3.2.3",
            "v3.2.2",
            "v3.2.1",
            "v3.2.0",
            "v3.1.2",
            "v3.1.1",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111059.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.611247186Z",
      "provider": "osv",
      "references": [
        "https://github.com/mljar/mercury/releases/tag/v3.2.11",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111059.json",
        "https://github.com/mljar/mercury/security/advisories/GHSA-2658-85cv-9wwq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111059",
        "https://github.com/mljar/mercury/commit/c798a85924e6614c6fea7afe5a560e4554a1d09b"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-116",
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111059.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111059",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492488,
  "published_at": "2026-10-19T16:11:29.745+00:00"
}