CVE-2026-111707

MEDIUM 5.3

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

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	vastxie
Product	99ai
Published	Oct 16, 2026
Last Updated	Oct 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

vastxie / 99AI

0 ≤ 4.3.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hackmd.io: https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor github.com: https://github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service.ts#L463-L475 github.com: https://github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts github.com: https://github.com/vastxie/99AI vulncheck.com: https://www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-chat-message-disclosure

Credits

hieuPenguinnn