{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c45d43146167324bae06bdf09de3e4bd2e5e478f"
            }
          ],
          "repo": "https://github.com/os4ed/opensis-classic",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Fluid Attacks",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8406.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "9.3"
          },
          {
            "last_affected": "9.3"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "openSIS Classic 9.3 contains an insecure direct object reference vulnerability in the messaging module. Any authenticated user with access to the messaging module can request sent-message details from modules/messaging/SentMail.php by supplying an arbitrary mail_id value.",
  "id": "CVE-2026-8406",
  "modified": "2026-07-15T01:48:52.049224241Z",
  "published": "2026-06-11T13:32:36.738Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://fluidattacks.com/es/advisories/melanie"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8406.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8406"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OS4ED/openSIS-Classic"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail"
}