Auth0 PHP SDK Insufficient Entropy in Cookie Encryption

{
  "id": "9f370024bd5ec9a597c8bbcdd8517e61cee271ad774c8a099509b3bf7b41e9b1",
  "url": "https://osv.dev/vulnerability/CVE-2026-34236",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Auth0 PHP SDK Insufficient Entropy in Cookie Encryption",
    "summary": "Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. From version 8.0.0 to before version 8.19.0, in applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies. This issue has been patched in version 8.19.0.",
    "evidence": "osv:CVE-2026-34236",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-34236",
      "aliases": [
        "CVE-2026-34236",
        "GHSA-w3wc-44p4-m4j7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/auth0/auth0-php",
              "type": "GIT",
              "events": [
                {
                  "introduced": "57caf1cc0ab3b6f5ef6615db364fdc3261749fc0"
                },
                {
                  "fixed": "043ddd31e75ce383c6060c30c683cfa3b5dd8c3b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.19.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "043ddd31e75ce383c6060c30c683cfa3b5dd8c3b"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "8.19.0"
                  },
                  {
                    "cpe": "cpe:2.3:a:auth0:auth0-php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.19.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "8.18.0",
            "8.17.0",
            "8.16.0",
            "8.15.0",
            "8.14.0",
            "8.13.0",
            "8.12.0",
            "8.11.1",
            "8.11.0",
            "8.10.0",
            "8.9.3",
            "8.9.1",
            "8.9.0",
            "8.8.0",
            "8.7.1",
            "8.7.0",
            "8.6.0",
            "8.5.0",
            "8.4.0",
            "8.3.7",
            "8.3.6",
            "8.3.5",
            "8.3.4",
            "8.3.3",
            "8.3.2",
            "8.3.1",
            "8.3.0",
            "8.2.1",
            "8.2.0",
            "8.1.0",
            "8.0.6",
            "8.0.5",
            "8.0.4",
            "8.0.3",
            "8.0.2",
            "8.0.1",
            "8.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34236.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.533671788Z",
      "provider": "osv",
      "references": [
        "https://github.com/auth0/auth0-PHP/releases/tag/8.19.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34236.json",
        "https://github.com/auth0/auth0-PHP/security/advisories/GHSA-w3wc-44p4-m4j7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34236"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-331"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34236.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34236",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517948,
  "published_at": "2026-04-01T17:04:53.378+00:00"
}