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Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms

Type: advisorySources: OSV

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the install route guard in ci4ms relies solely on a volatile cache check (cache('settings')) combined with .env file existence to block post-installation access to the setup wizard. When the database is temporarily unreachable during a cache miss (TTL expiry or admin-triggered cache clear), the guard fails open, allowing an unauthenticated attacker to overwrite the .env file with attacker-controlled database credentials, achieving full application takeover. This vulnerability is fixed in 0.31.4.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-39393
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 05:16 UTC · Revision 1

Source evidence

Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms

core-osv · Original source

Published 8 Apr 2026, 14:31 UTC

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the install route guard in ci4ms relies solely on a volatile cache check (cache('settings')) combined with .env file existence to block post-installation access to the setup wizard. When the database is temporarily unreachable during a cache miss (TTL expiry or admin-triggered cache clear), the guard fails open, allowing an unauthenticated attacker to overwrite the .env file with attacker-controlled database credentials, achieving full application takeover. This vulnerability is fixed in 0.31.4.0.

osv:CVE-2026-39393
Complete source record
{
  "id": "f51fe93c4aca8447997596c3304dfdb0391537e9e595fd16c5c44878cea7b78b",
  "url": "https://osv.dev/vulnerability/CVE-2026-39393",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms",
    "summary": "CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the install route guard in ci4ms relies solely on a volatile cache check (cache('settings')) combined with .env file existence to block post-installation access to the setup wizard. When the database is temporarily unreachable during a cache miss (TTL expiry or admin-triggered cache clear), the guard fails open, allowing an unauthenticated attacker to overwrite the .env file with attacker-controlled database credentials, achieving full application takeover. This vulnerability is fixed in 0.31.4.0.",
    "evidence": "osv:CVE-2026-39393",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-39393",
      "aliases": [
        "CVE-2026-39393",
        "GHSA-8rh5-4mvx-xj7j"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ci4-cms-erp/ci4ms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "379ebb6022883c1bc01dba9db3c19ff29c46b7dd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.31.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.31.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.31.3.0",
            "0.31.2.0",
            "0.31.1.0",
            "0.31.0.0",
            "0.28.6.0",
            "0.28.5.0",
            "0.28.4.0",
            "0.28.3.0",
            "0.28.0.0",
            "0.27.0.0",
            "0.26.3.4",
            "0.26.3.3",
            "0.26.3.2",
            "0.26.3.1",
            "0.26.3.0",
            "0.26.2.0",
            "0.26.1.0",
            "0.26.0.0",
            "0.25.3.0",
            "0.25.2.0",
            "0.25.1.0",
            "0.25.0.43",
            "0.25.0.39",
            "0.25.0.30",
            "0.25.0.2",
            "0.25.0.1",
            "0.25.0.0",
            "0.24.0.60",
            "0.24.0.45",
            "0.24.0.42",
            "0.24.0.27",
            "0.24.0.20",
            "0.24.0.19",
            "0.24.0.18",
            "0.24.0.16",
            "0.24.0.0",
            "0.23.1.0",
            "0.23.0.0",
            "0.21.3.7",
            "0.21.3.6",
            "0.21.3.5",
            "0.21.3.4",
            "0.21.3.3",
            "0.21.3.2",
            "0.21.3.1",
            "0.21.3",
            "0.21.2",
            "0.21.1",
            "0.21.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39393.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.388931580Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39393.json",
        "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-8rh5-4mvx-xj7j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-39393"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39393.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-39393",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500466,
  "published_at": "2026-04-08T14:31:44.692+00:00"
}