openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)

{
  "id": "56d2d71a3c1cc41b6765df6c3c7c0dd5d327a6a2c5d9869d150f000d70d3ef87",
  "url": "https://osv.dev/vulnerability/CVE-2026-91107",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)",
    "summary": "openSIS Classic 9.3 allows an authenticated user with the built-in teacher role can select an arbitrary staff record through staff_id and cause the School Information update path to reset that selected account's password.",
    "evidence": "osv:CVE-2026-91107",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-91107",
      "aliases": [
        "CVE-2026-91107"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/os4ed/opensis-classic",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "24bb530391a67c114cd4fe3dff65da7e070f5ed1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "24bb530391a67c114cd4fe3dff65da7e070f5ed1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "V9.2",
            "V9.1",
            "V9.0",
            "V8.0",
            "V7.6",
            "V7.5",
            "ver7.4",
            "v7.3",
            "v7.2",
            "ver7.1",
            "v7.1",
            "Ver7.0Prod_update",
            "Ver7.0beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91107.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.732549048Z",
      "provider": "osv",
      "references": [
        "https://fluidattacks.com/advisories/hearts",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91107.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-91107",
        "https://github.com/OS4ED/openSIS-Classic/commit/24bb530391a67c114cd4fe3dff65da7e070f5ed1",
        "https://github.com/OS4ED/openSIS-Classic"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "Fluid Attacks",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.3"
                  },
                  {
                    "last_affected": "9.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91107.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-91107",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490117,
  "published_at": "2026-10-05T21:29:29.268+00:00"
}