File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)

{
  "id": "0752711b262871205041a382b05656cf2c47a9b6e71d885207c5fccb2c2e770c",
  "url": "https://osv.dev/vulnerability/CVE-2026-62843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)",
    "summary": "File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. From 2.63.6 to 2.63.16, File Browser's archive builder uses strings.ReplaceAll(nameInArchive, \"\\\", \"/\"), which turns a POSIX filename such as ..\\..\\evil.sh into the archive entry ../../evil.sh, allowing a user with upload permission to plant a backslash-named file that escapes the extraction directory when another user downloads and extracts the generated zip or tar archive. This issue is fixed in version 2.63.17.",
    "evidence": "osv:CVE-2026-62843",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-62843",
      "aliases": [
        "CVE-2026-62843",
        "GHSA-83xp-526h-j3ww",
        "GO-2026-6026"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/filebrowser/filebrowser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "85b7d2762dda67b6158220991654c65b43739005"
                },
                {
                  "fixed": "d76b7d161099853f17e71b1327ce4545a30c27a2"
                },
                {
                  "fixed": "8503ba61ff51d48a7313896483d130eb6a5abfe0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.63.6"
                      },
                      {
                        "fixed": "2.63.17"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8503ba61ff51d48a7313896483d130eb6a5abfe0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d76b7d161099853f17e71b1327ce4545a30c27a2"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.63.17"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.63.16",
            "v2.63.15",
            "v2.63.14",
            "v2.63.13",
            "v2.63.12",
            "v2.63.11",
            "v2.63.10",
            "v2.63.9",
            "v2.63.8",
            "v2.63.7",
            "v2.63.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62843.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.165874310Z",
      "provider": "osv",
      "references": [
        "https://github.com/filebrowser/filebrowser/releases/tag/v2.63.17",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62843.json",
        "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-83xp-526h-j3ww",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62843",
        "https://github.com/filebrowser/filebrowser/commit/8503ba61ff51d48a7313896483d130eb6a5abfe0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22",
          "CWE-23"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62843.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62843",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507596,
  "published_at": "2026-07-15T15:42:19.122+00:00"
}