Oppia through 3.5.2 Missing Authorization on AdminRoleHandler GET

{
  "id": "9c5f64318ae85530289fa607d9576de913777fb26fb09bbe262a2857e2758d61",
  "url": "https://osv.dev/vulnerability/CVE-2026-85210",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Oppia through 3.5.2 Missing Authorization on AdminRoleHandler GET",
    "summary": "Oppia's AdminRoleHandler GET endpoint in core/controllers/admin.py is decorated with open_access, allowing any registered user to enumerate privileged accounts and roles. Attackers can query the endpoint with filter_criterion parameters to retrieve usernames holding specific roles, banned flags, and managed topic identifiers without authorization.",
    "evidence": "osv:CVE-2026-85210",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-85210",
      "aliases": [
        "CVE-2026-85210"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/oppia/oppia",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "380f9db39baba66ab6d2210a38da0d4825466300"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.5.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.5.2",
            "v2.8.6",
            "v2.6.8",
            "v2.3.7",
            "v2.3.6",
            "v2.3.5",
            "v2.3.4",
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.2.0",
            "v2.1.4",
            "v2.1.2",
            "v2.1.0",
            "v2.0.3",
            "v2.0.0",
            "v2.0.0.rc.2",
            "v2.0.0.rc.1",
            "v1.2.8",
            "v1.2.7",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85210.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.368806114Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85210.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-85210",
        "https://www.vulncheck.com/advisories/oppia-through-3.5.2-missing-authorization-on-adminrolehandler-get",
        "https://github.com/oppia/oppia/issues/26652",
        "https://github.com/oppia/oppia",
        "https://github.com/oppia/oppia/blob/v3.5.2/core/controllers/admin.py"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85210.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-85210",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495312,
  "published_at": "2026-09-03T14:12:21.815+00:00"
}