PILOS Misconfigured the Access-Control-Allow-Origin Header

{
  "id": "dd4ce6475756472b6498fac55901b73295fb211e5941d60216922afe558aedb0",
  "url": "https://osv.dev/vulnerability/CVE-2025-62523",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PILOS Misconfigured the Access-Control-Allow-Origin Header",
    "summary": "PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. PILOS before 4.8.0 includes a Cross-Origin Resource Sharing (CORS) misconfiguration in its middleware: it reflects the Origin request header back in the Access-Control-Allow-Origin response header without proper validation or a whitelist, while Access-Control-Allow-Credentials is set to true. This behavior could allow a malicious website on a different origin to send requests (including credentials) to the PILOS API. This may enable exfiltration or actions using the victim’s credentials if the server accepts those cross-origin requests as authenticated. Laravel’s session handling applies additional origin checks such that cross-origin requests are not authenticated by default. Because of these session-origin protections, and in the absence of any other unknown vulnerabilities that would bypass Laravel’s origin/session checks, this reflected-Origin CORS misconfiguration is not believed to be exploitable in typical PILOS deployments. This vulnerability has been patched in PILOS in v4.8.0",
    "evidence": "osv:CVE-2025-62523",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-62523",
      "aliases": [
        "CVE-2025-62523",
        "GHSA-pgfw-f4mp-5445"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/thm-health/pilos",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "abc974d1ed81995ff6cadf7184d5d5c11e57e215"
                },
                {
                  "fixed": "14655bc4f8128ffd2b3c25004b01d9a802808da8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:thm:pilos:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.8.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "14655bc4f8128ffd2b3c25004b01d9a802808da8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.7.1",
            "v4.7.0",
            "v4.6.1",
            "v4.6.0",
            "v4.5.0",
            "v4.4.0",
            "v4.3.1",
            "v4.3.0",
            "v4.2.0",
            "v4.1.2",
            "v4.1.1",
            "v4.1.0",
            "v4.0.0",
            "v3.0.3",
            "v4.0.0-RC.4",
            "v4.0.0-RC.3",
            "v4.0.0-RC.2",
            "v4.0.0-RC.1",
            "v4.0.0-beta.2",
            "v4.0.0-beta.1",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v2.4.0",
            "v2.3.4",
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v2.0.0-RC.4",
            "v2.0.0-RC.3",
            "v2.0.0-RC.2",
            "v2.0.0-RC.1",
            "v2.0.0-alpha.5",
            "v2.0.0-alpha.4",
            "v2.0.0-alpha.3",
            "v2.0.0-alpha.2",
            "v2.0.0-alpha.1",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.0",
            "v1.7.1",
            "v1.7.0",
            "v1.6.1",
            "v1.6.0",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-62523.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.971659241Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62523.json",
        "https://github.com/THM-Health/PILOS/security/advisories/GHSA-pgfw-f4mp-5445",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-62523",
        "https://github.com/THM-Health/PILOS/commit/14655bc4f8128ffd2b3c25004b01d9a802808da8"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-942"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62523.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-62523",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496557,
  "published_at": "2025-10-27T20:10:51.351+00:00"
}