Security advisory

{
  "id": "9abd807d4ad886a713e81cbf29807697457c73c216a4925d08a3930eab2e4755",
  "url": "https://osv.dev/vulnerability/CVE-2026-104587",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-104587",
    "summary": "blob42 gosuki through commit 6e2bf34 contains a Stored Cross-Site Scripting (XSS) vulnerability. The application uses text/template instead of html/template, failing to perform context-aware auto-escaping on the URL and DisplayURL fields of bookmarks in internal/webui/templates/bookmarks.html. An attacker can craft a malicious bookmark URL containing HTML attribute-breaking payloads that execute arbitrary JavaScript in the victim's browser context when rendered in the local web interface.",
    "evidence": "osv:CVE-2026-104587",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-104587",
      "aliases": [
        "CVE-2026-104587"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/blob42/gosuki",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "6e2bf34"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "6e2bf34"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104587.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.040106987Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104587.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104587",
        "https://github.com/AmalJafarzade/CVE-2026-104587",
        "https://github.com/blob42/gosuki"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104587.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104587",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499194,
  "published_at": "2026-10-13T00:00:00+00:00"
}