NamelessMC: Reactions on private or blocking profile posts can be modified without proper authorization

{
  "id": "24dcc5393280d7ce0041f7462c5b64e85178fa678c628f45635ab98434bb3a18",
  "url": "https://osv.dev/vulnerability/CVE-2026-40571",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NamelessMC: Reactions on private or blocking profile posts can be modified without proper authorization",
    "summary": "NamelessMC is website software for Minecraft servers. In version 2.2.4, `core/classes/Misc/ProfilePostReactionContext.php` only verifies that the wall post exists and does not enforce blocked/private-profile visibility. This means that authenticated low-privileged users can add reactions to private or blocking profile posts. Version 2.2.5 contains a patch.",
    "evidence": "osv:CVE-2026-40571",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-40571",
      "aliases": [
        "CVE-2026-40571",
        "GHSA-47hr-jj6c-rqf9"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/namelessmc/nameless",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a1ee7ef46718836a3a9a4408cb5bc7c5a08b7efc"
                },
                {
                  "last_affected": "a1ee7ef46718836a3a9a4408cb5bc7c5a08b7efc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "= 2.2.4"
                      },
                      {
                        "last_affected": "= 2.2.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "= 2.2.4",
            "v2.2.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40571.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.140171867Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40571.json",
        "https://github.com/NamelessMC/Nameless/security/advisories/GHSA-47hr-jj6c-rqf9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40571"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40571.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40571",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497150,
  "published_at": "2026-06-02T16:44:14.286+00:00"
}