SFTPGo improperly sanitizes placeholders in group home directories/key prefixes

{
  "id": "ada70c535310c919a9c15dbb46487628d1efd80894a530d35726483c02e4c6d4",
  "url": "https://osv.dev/vulnerability/CVE-2026-30915",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SFTPGo improperly sanitizes placeholders in group home directories/key prefixes",
    "summary": "SFTPGo is an open source, event-driven file transfer solution. SFTPGo versions before v2.7.1 contain an input validation issue in the handling of dynamic group paths, for example, home directories or key prefixes. When a group is configured with a dynamic home directory or key prefix using placeholders like %username%, the value replacing the placeholder is not strictly sanitized against relative path components. Consequently, if a user is created with a specially crafted username the resulting path may resolve to a parent directory instead of the intended sub-directory. This issue is fixed in version v2.7.1",
    "evidence": "osv:CVE-2026-30915",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-30915",
      "aliases": [
        "CVE-2026-30915",
        "GHSA-m83q-5wr4-4gfp",
        "GO-2026-4697"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/drakkan/sftpgo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9ae473fcdc401b1d31cfef9315f6f7ba509deb32"
                },
                {
                  "fixed": "131234866cbfd2a05d0b35545eca6af032b69d88"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.3.0"
                      },
                      {
                        "fixed": "2.7.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:sftpgo_project:sftpgo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.3.0"
                      },
                      {
                        "fixed": "2.7.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.7.0",
            "v2.6.0",
            "v2.5.1",
            "v2.5.0",
            "v2.4.0",
            "v2.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30915.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.886571356Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30915.json",
        "https://github.com/drakkan/sftpgo/security/advisories/GHSA-m83q-5wr4-4gfp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-30915"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30915.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-30915",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519331,
  "published_at": "2026-03-13T19:04:36.856+00:00"
}