CVE-2026-111707

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
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
https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor
https://www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-chat-message-disclosure
https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor

Configurations

No configuration.

History

16 Oct 2026, 19:17

Type	Values Removed	Values Added
References	~~() https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor -~~	() https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor -

16 Oct 2026, 18:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-16 18:17

Updated : 2026-10-16 19:17

NVD link : CVE-2026-111707

Mitre link : CVE-2026-111707

CVE.ORG link : CVE-2026-111707

JSON object : View

Products Affected

No product.

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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