Security advisory

{
  "id": "c91c73fe085f49229792790183281ad23af6fb6b12b01e9590697c7ac7529941",
  "url": "https://osv.dev/vulnerability/CVE-2021-41129",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41129",
    "summary": "Pterodactyl is an open-source game server management panel built with PHP 7, React, and Go. A malicious user can modify the contents of a `confirmation_token` input during the two-factor authentication process to reference a cache value not associated with the login attempt. In rare cases this can allow a malicious actor to authenticate as a random user in the Panel. The malicious user must target an account with two-factor authentication enabled, and then must provide a correct two-factor authentication token before being authenticated as that user. Due to a validation flaw in the logic handling user authentication during the two-factor authentication process a malicious user can trick the system into loading credentials for an arbitrary user by modifying the token sent to the server. This authentication flaw is present in the `LoginCheckpointController@__invoke` method which handles two-factor authentication for a user. This controller looks for a request input parameter called `confirmation_token` which is expected to be a 64 character random alpha-numeric string that references a value within the Panel's cache containing a `user_id` value. This value is then used to fetch the user that attempted to login, and lookup their two-factor authentication token. Due to the design of this system, any element in the cache that contains only digits could be referenced by a malicious user, and whatever value is stored at that position would be used as the `user_id`. There are a few d",
    "evidence": "osv:CVE-2021-41129",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-41129",
      "aliases": [
        "CVE-2021-41129",
        "GHSA-5vfx-8w6m-h3v4"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pterodactyl/panel",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d795668fc202707749bb418e1a735338f78d26dd"
                },
                {
                  "fixed": "c57eb2c9e6e31823669c4ec444afed9f3e156a5e"
                },
                {
                  "fixed": "4a84c36009be10dbd83051ac1771662c056e4977"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pterodactyl:panel:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "fixed": "1.6.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4a84c36009be10dbd83051ac1771662c056e4977"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c57eb2c9e6e31823669c4ec444afed9f3e156a5e"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.6.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.6.1",
            "v1.6.0",
            "v1.5.1",
            "v1.5.0",
            "v1.4.2",
            "v1.4.1",
            "v1.4.0",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41129.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:56.091226929Z",
      "provider": "osv",
      "references": [
        "https://github.com/pterodactyl/panel/blob/v1.6.2/CHANGELOG.md#v162",
        "https://github.com/pterodactyl/panel/releases/tag/v1.6.2",
        "https://github.com/pterodactyl/panel/security/advisories/GHSA-5vfx-8w6m-h3v4",
        "https://github.com/pterodactyl/panel/commit/4a84c36009be10dbd83051ac1771662c056e4977"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41129",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384774,
  "published_at": "2021-10-06T20:15:19.897+00:00"
}