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goshs has a file-based ACL authorization bypass in goshs state-changing routes

Type: advisorySources: OSV

goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload files with PUT, upload files with multipart POST /upload, create directories with ?mkdir, and delete files with ?delete inside a .goshs-protected directory. By deleting the .goshs file itself, the attacker can remove the folder's auth policy and then access previously protected content without credentials. This results in a critical authorization bypass affecting confidentiality, integrity, and availability. This vulnerability is fixed in 2.0.0-beta.4.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-40189
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 17:46 UTC · Revision 1

Source evidence

goshs has a file-based ACL authorization bypass in goshs state-changing routes

core-osv · Original source

Published 10 Apr 2026, 19:44 UTC

goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload files with PUT, upload files with multipart POST /upload, create directories with ?mkdir, and delete files with ?delete inside a .goshs-protected directory. By deleting the .goshs file itself, the attacker can remove the folder's auth policy and then access previously protected content without credentials. This results in a critical authorization bypass affecting confidentiality, integrity, and availability. This vulnerability is fixed in 2.0.0-beta.4.

osv:CVE-2026-40189
Complete source record
{
  "id": "3d0cfb5b70f23340b28253a60b6159ec83b43baaaba146bc071eff11d1b96682",
  "url": "https://osv.dev/vulnerability/CVE-2026-40189",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "goshs has a file-based ACL authorization bypass in goshs state-changing routes",
    "summary": "goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload files with PUT, upload files with multipart POST /upload, create directories with ?mkdir, and delete files with ?delete inside a .goshs-protected directory. By deleting the .goshs file itself, the attacker can remove the folder's auth policy and then access previously protected content without credentials. This results in a critical authorization bypass affecting confidentiality, integrity, and availability. This vulnerability is fixed in 2.0.0-beta.4.",
    "evidence": "osv:CVE-2026-40189",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-40189",
      "aliases": [
        "CVE-2026-40189",
        "GHSA-wvhv-qcqf-f3cx",
        "GO-2026-5728"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/goshs-labs/goshs",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0c316e71c6eb69d75218c4af6e9793cc07cdfaab"
                },
                {
                  "fixed": "f212c4f4a126556bab008f79758e21a839ef2c0f"
                },
                {
                  "fixed": "10f291dea17fb795f0008ed64c3ad7ab8c0470de"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.0.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f212c4f4a126556bab008f79758e21a839ef2c0f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "10f291dea17fb795f0008ed64c3ad7ab8c0470de"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.0.0-beta.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.1.4",
            "v2.0.0-beta.3",
            "v2.0.0-beta.2",
            "v2.0.0-beta.1",
            "1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.9",
            "v1.0.8",
            "v1.0.7",
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.9",
            "v0.3.8",
            "v0.3.7",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.9",
            "v0.1.8",
            "v0.1.7",
            "v0.1.6",
            "v0.1.5",
            "v0.1.4",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0",
            "v0.0.9",
            "v0.0.8",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40189.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.332235378Z",
      "provider": "osv",
      "references": [
        "https://github.com/patrickhener/goshs/releases/tag/v2.0.0-beta.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40189.json",
        "https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40189",
        "https://github.com/patrickhener/goshs/commit/f212c4f4a126556bab008f79758e21a839ef2c0f"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40189.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40189",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497989,
  "published_at": "2026-04-10T19:44:54.672+00:00"
}