cti-transmute Conversion Table Allows XSS via Unescaped Cell Content During Search Highlighting

{
  "id": "4db7aa7aaa80822b37a04eaf9d61e5637ca1222e884f85ae6a211ac9fe4d8823",
  "url": "https://osv.dev/vulnerability/CVE-2026-73161",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cti-transmute Conversion Table Allows XSS via Unescaped Cell Content During Search Highlighting",
    "summary": "Affected versions of cti-transmute improperly handle conversion-table values passed through the search highlighting feature. The highlight() function previously returned the underlying text directly when no search query was supplied, or performed a regex replacement that inserted tags without first escaping the original content. Because the resulting value is used by an HTML-rendering sink, malicious markup contained in conversion data could be interpreted as HTML rather than displayed as text. The fix introduces a shared highlightMatches() helper that first converts special characters such as <, >, &, and quotes into HTML entities. Only after escaping does the code insert the application-controlled element used for search highlighting.",
    "evidence": "osv:CVE-2026-73161",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-73161",
      "aliases": [
        "CVE-2026-73161"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/cti-transmute",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ac495641ef3ca927676a73ba8f1bcdfd952413df"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "ac495641ef3ca927676a73ba8f1bcdfd952413df"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73161.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.142656366Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73161.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73161",
        "https://github.com/MISP/cti-transmute/commit/ac495641ef3ca927676a73ba8f1bcdfd952413df",
        "https://github.com/MISP/cti-transmute"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-116",
          "CWE-79"
        ],
        "cna_assigner": "CIRCL",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.4.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73161.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73161",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507769,
  "published_at": "2026-08-11T09:07:53.955+00:00"
}