CVE-2026-111707
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor (third-party-advisory)
- github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service… (technical-description)
- github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts (technical-description)
- github.com/vastxie/99AI (product)
- www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysingl… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111707?
- CVE-2026-111707 is a medium-severity vulnerability, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-10-16.
- How severe is CVE-2026-111707?
- Medium severity. CVSS v3 base score is 5.3 out of 10.