CVE-2026-111707CWE-639

CVE-2026-111707

Medium · published October 16, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
22.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
6.9 · 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
EPSS
0.00310 · 22.6th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-10-16T22:17Z
References (6)
https://github.com/vastxie/99AI · [email protected]https://github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts · [email protected]https://github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service.ts#L463-L475 · [email protected]https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor · [email protected]https://www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-chat-message-disclosure · [email protected]https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 18 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 16 OCT 17:39Z
    99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message Disclosure
    cvelistv5
  • 16 OCT 17:39Z
    99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message Disclosure
    cvelistv5