CVE-2026-111707 99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message Disclosure
Unauthenticated attackers can read other users' chat messages and task data by exploiting an insecure direct object reference in the querySingleChat API.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-111707?
CVE-2026-111707 is a medium-severity missing authorization vulnerability in vastxie 99AI, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-111707?
How do I fix CVE-2026-111707?
No fix has been published for CVE-2026-111707 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-111707 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111707 exists.
Sources
Also known as GHSA-ghmq-xxc8-j8m5.