99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message Disclosure

{
  "id": "f435d79f2dd08d58c9455cb9a1f7f4fe5e46869d1d1531635e4996469d55daa8",
  "url": "https://osv.dev/vulnerability/CVE-2026-111707",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message Disclosure",
    "summary": "99AI through 4.3.0 contains an insecure direct object reference vulnerability that allows unauthenticated attackers to read other users' chat messages because querySingleChat lacks an owner check. Attackers can send a fingerprint header to obtain a visitor JWT and iterate sequential chatId values to retrieve other users' message content and task data.",
    "evidence": "osv:CVE-2026-111707",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-111707",
      "aliases": [
        "CVE-2026-111707"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vastxie/99ai",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "cbebbfbd823c428f6aaae72d2f8e71cb785ef970"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.3.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "99AI"
                      },
                      {
                        "last_affected": "4.3.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.3.0",
            "v4.1.0",
            "v4.0.0",
            "v3.7.0",
            "v3.5.0",
            "v3.3.0",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111707.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.751321358Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111707.json",
        "https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111707",
        "https://www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-chat-message-disclosure",
        "https://github.com/vastxie/99AI",
        "https://github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts",
        "https://github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service.ts#L463-L475"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111707.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111707",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497807,
  "published_at": "2026-10-16T17:39:58.546+00:00"
}