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Medium

Caddy: fileHidden() case-sensitive pattern bypass — exposes "hidden" files via case variation

Type: advisorySources: OSV

Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, in modules/caddyhttp/fileserver/staticfiles.go, fileHidden() uses case-sensitive filepath.Match checks, so case variants can bypass hide rules on case-insensitive filesystems or when mixed-case paths coexist and expose files intended to be hidden.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-77281, CVE-2026-92284, CVE-2026-92700
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 22:28 UTC · Revision 1

Source evidence

Caddy: fileHidden() case-sensitive pattern bypass — exposes "hidden" files via case variation

core-osv · Original source

Published 23 Sept 2026, 17:58 UTC

Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, in modules/caddyhttp/fileserver/staticfiles.go, fileHidden() uses case-sensitive filepath.Match checks, so case variants can bypass hide rules on case-insensitive filesystems or when mixed-case paths coexist and expose files intended to be hidden.

osv:CVE-2026-92700
Complete source record
{
  "id": "12644bc8cc155b3a140cf1a25ce6df792d5105a6fba5b5e6404533bd2b405707",
  "url": "https://osv.dev/vulnerability/CVE-2026-92700",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Caddy: fileHidden() case-sensitive pattern bypass — exposes \"hidden\" files via case variation",
    "summary": "Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, in modules/caddyhttp/fileserver/staticfiles.go, fileHidden() uses case-sensitive filepath.Match checks, so case variants can bypass hide rules on case-insensitive filesystems or when mixed-case paths coexist and expose files intended to be hidden.",
    "evidence": "osv:CVE-2026-92700",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-92700",
      "aliases": [
        "CVE-2026-77281",
        "CVE-2026-92284",
        "CVE-2026-92700",
        "GHSA-j8px-rmrx-76h9",
        "GO-2026-6512"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/caddyserver/caddy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "cc58caa1099240ef1a4c280b892260b380a85c86"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.11.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.11.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.11.3",
            "v2.11.2",
            "v2.11.1",
            "v2.11.0",
            "v2.11.0-beta.2",
            "v2.11.0-beta.1",
            "v2.10.2",
            "v2.10.1",
            "v2.10.0",
            "v2.10.0-beta.4",
            "v2.10.0-beta.3",
            "v2.9.1",
            "v2.10.0-beta.2",
            "v2.10.0-beta.1",
            "v2.9.0",
            "v2.9.0-beta.3",
            "v2.9.0-beta.2",
            "v2.9.0-beta.1",
            "v2.8.4",
            "v2.8.3",
            "v2.8.2",
            "v2.8.1",
            "v2.8.0",
            "v2.8.0-rc.1",
            "v2.8.0-beta.2",
            "v2.8.0-beta.1",
            "v2.7.5",
            "v2.7.4",
            "v2.7.3",
            "v2.7.2",
            "v2.7.1",
            "v2.7.0",
            "v2.7.0-beta.2",
            "v2.7.0-beta.1",
            "v2.6.4",
            "v2.6.3",
            "v2.6.2",
            "v2.6.1",
            "v2.6.0",
            "v2.6.0-beta.5",
            "v2.6.0-beta.4",
            "v2.6.0-beta.3",
            "v2.6.0-beta.2",
            "v2.6.0-beta.1",
            "v2.5.2",
            "v2.5.1",
            "v2.5.0",
            "v2.5.0-rc.1",
            "v2.5.0-beta.1",
            "v2.4.6",
            "v2.4.5",
            "v2.4.4",
            "v2.4.3",
            "v2.4.2",
            "v2.4.1",
            "v2.4.0",
            "v2.4.0-rc.1",
            "v2.4.0-beta.2",
            "v2.4.0-beta.1",
            "v2.3.0-rc.2",
            "v2.3.0",
            "v2.3.0-rc.1",
            "v2.3.0-beta.1",
            "v2.2.3",
            "v2.2.1",
            "v2.2.0",
            "v2.2.0-rc.3",
            "v2.2.0-rc.2",
            "v2.2.0-rc.1",
            "v2.1.1",
            "v2.1.0",
            "v2.1.0-beta.2",
            "v2.1.0-beta.1",
            "v2.0.0",
            "v2.0.0-rc.3",
            "v2.0.0-rc.2",
            "v2.0.0-rc.1",
            "v2.0.0-beta.20",
            "v2.0.0-beta.19",
            "v2.0.0-beta.18",
            "v2.0.0-beta.17",
            "v2.0.0-beta.16",
            "v2.0.0-beta.15",
            "v2.0.0-beta.14",
            "v2.0.0-beta.13",
            "v2.0.0-beta12",
            "v2.0.0-beta11",
            "v2.0.0-beta10",
            "v2.0.0-beta9",
            "v2.0.0-beta8",
            "v2.0.0-beta7",
            "v2.0.0-beta6",
            "v2.0.0-beta5",
            "v2.0.0-beta4",
            "v2.0.0-beta3",
            "v2.0.0-beta2",
            "v2.0.0-beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92700.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.890494819Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92700.json",
        "https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92700"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-178"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92700.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77281",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-92284",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-92700",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507624,
  "published_at": "2026-09-23T17:58:45.844+00:00"
}