Misaka Danmu Server through 2.8.9 Authentication Bypass via Config-History Rollback

{
  "id": "4bd8d82ff5e970f402f5eb8cc225fb4a600a8e61dfeee6c01f6b04a94a7787df",
  "url": "https://osv.dev/vulnerability/CVE-2026-111643",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Misaka Danmu Server through 2.8.9 Authentication Bypass via Config-History Rollback",
    "summary": "Misaka Danmu Server through 2.8.9 contains an authentication bypass vulnerability that allows unauthenticated attackers to write arbitrary configuration keys via the unprotected POST /api/ui/config-history/rollback endpoint. Attackers can set the ipWhitelist key to their own /32 address, or alter trustedProxies and webhookApiKey, to access every protected endpoint as the administrator.",
    "evidence": "osv:CVE-2026-111643",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-111643",
      "aliases": [
        "CVE-2026-111643"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/l429609201/misaka_danmu_server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "01751526f6e4154bcc8f517481d02b68cb2684a9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.8.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.8.9"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.8.9",
            "v2.8.8",
            "v2.8.7",
            "v2.8.6",
            "v2.8.5",
            "v2.8.4",
            "v2.8.3",
            "v2.8.2",
            "v2.8.1",
            "v2.8.0",
            "v2.7.9",
            "v2.7.8",
            "v2.7.7",
            "v2.7.6",
            "v2.7.5",
            "v2.7.4",
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            "v2.7.2",
            "v2.7.1",
            "v2.7.0",
            "v2.6.9",
            "v2.6.8",
            "v2.6.7",
            "v2.6.6",
            "v2.6.5",
            "v2.6.4",
            "v2.6.3",
            "v2.6.2",
            "v2.6.1",
            "v2.6.0",
            "v2.5.9-1",
            "v2.5.9",
            "v2.5.8",
            "v2.5.7",
            "v2.5.6",
            "v2.5.5",
            "v2.5.4",
            "v2.5.3",
            "v2.5.2-1",
            "v2.5.2",
            "v2.5.1",
            "v2.5.0",
            "v2.4.3",
            "v2.4.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.9",
            "v2.3.8",
            "v2.3.7",
            "v2.3.6",
            "v2.3.5",
            "v2.3.4",
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            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.2.9",
            "v2.2.8",
            "v2.2.7",
            "v2.2.6",
            "v2.2.5",
            "v2.2.4",
            "v2.2.3",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.9",
            "v2.1.8",
            "v2.1.7",
            "v2.1.6",
            "v2.1.5",
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.24",
            "v2.0.23",
            "v2.0.22",
            "v2.0.21",
            "v2.0.20",
            "v2.0.19",
            "v2.0.18",
            "v2.0.17",
            "v2.0.16",
            "v2.0.15",
            "v2.0.14",
            "v2.0.13",
            "v2.0.12",
            "v2.0.11",
            "v2.0.10",
            "v2.0.9",
            "v2.0.8",
            "v2.0.7",
            "v2.0.6",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111643.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.316288845Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111643.json",
        "https://hackmd.io/@hieuPenguinnn/misaka-danmu-server-ui-api-missing-authentication",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111643",
        "https://www.vulncheck.com/advisories/misaka-danmu-server-through-2.8.9-authentication-bypass-via-config-history-rollback",
        "https://github.com/l429609201/misaka_danmu_server",
        "https://github.com/l429609201/misaka_danmu_server/blob/v2.8.9/src/api/ui/config_history.py#L51-L66",
        "https://github.com/l429609201/misaka_danmu_server/blob/v2.8.9/src/security.py#L136-L182"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111643.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111643",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495011,
  "published_at": "2026-10-16T17:39:13.043+00:00"
}