League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass

{
  "id": "a0d16edc800b291dfdfefb7846323bc7fc6c5312dedddad40f06aac86f4088ce",
  "url": "https://osv.dev/vulnerability/CVE-2026-105829",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass",
    "summary": "League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone",
    "evidence": "osv:CVE-2026-105829",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-105829",
      "aliases": [
        "CVE-2026-105829",
        "GHSA-97jj-33gv-5xf9"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/thephpleague/commonmark",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4f30be7a2cbf3bfa5788abab71384713e48f451f"
                },
                {
                  "fixed": "692e90b901877bdfd727e51270ce4394633c6e74"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "fixed": "2.10.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105829.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.018334905Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105829.json",
        "https://github.com/thephpleague/commonmark/security/advisories/GHSA-97jj-33gv-5xf9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-105829",
        "https://www.vulncheck.com/advisories/league-commonmark-1.3.0-before-2.10.2-stored-xss-via-disallowedrawhtml-bypass"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-80"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105829.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-105829",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498085,
  "published_at": "2026-10-08T14:10:30.523+00:00"
}