Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

{
  "id": "3fa4c0eb60c350d867048feb5ff28ee671a7f73ec9fa5f3aa3b1a5647cbb03b0",
  "url": "https://osv.dev/vulnerability/CVE-2026-110628",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment",
    "summary": "Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.",
    "evidence": "osv:CVE-2026-110628",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-110628",
      "aliases": [
        "CVE-2026-110628",
        "CVE-2026-32255",
        "GHSA-qrx8-9hc6-jvqg"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kanbn/kan",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2360c5075d0c194c405831aff05f515683a6cae7"
                },
                {
                  "fixed": "53397d8e81dc1494d94132848c1f0416f1152bd7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.5.5"
                      },
                      {
                        "last_affected": "0.6.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "53397d8e81dc1494d94132848c1f0416f1152bd7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110628.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.053742418Z",
      "provider": "osv",
      "references": [
        "https://github.com",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110628.json",
        "https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg",
        "https://hackmd.io/@leediay/HyIxU63ofg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-110628",
        "https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment",
        "https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7",
        "https://github.com/kanbn/kan/pull/590",
        "https://github.com/kanbn/kan",
        "https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27",
        "https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110628.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-110628",
        "evidence": "/id"
      },
      {
        "value": "CVE-2026-32255",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507729,
  "published_at": "2026-10-14T14:17:03.232+00:00"
}