Security advisory

{
  "id": "5adbe15c867e2a535e6cfbd0177e992127fd517d6051384cc2b220a5571c355f",
  "url": "https://osv.dev/vulnerability/CVE-2019-5440",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-5440",
    "summary": "Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver < v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.",
    "evidence": "osv:CVE-2019-5440",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-5440",
      "aliases": [
        "CVE-2019-5440"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/revive-adserver/revive-adserver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0c98116a29bcb19dccbc8ec49d3cbb9cafd7a17b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:revive-adserver:revive_adserver:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.2.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.2.0",
            "v4.2.0-rc1",
            "v4.1.4",
            "v4.1.3",
            "v4.1.2",
            "v4.1.0",
            "v4.1.0-rc1",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v4.0.0-rc1",
            "v3.2.1",
            "v3.2.1-rc1",
            "v3.2.0",
            "v3.2.0-beta",
            "v3.1.0",
            "v3.1.0-beta",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-5440.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:01.475403923Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/reports/576504"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-5440",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 439801,
  "published_at": "2019-05-28T19:29:06.19+00:00"
}