CVE-2026-110611 REBUILD through 4.5.0 Authorization Bypass via aibot2 Chat Endpoints chatid
Authenticated users can access or modify other users' AI chat sessions by manipulating the chatid parameter in REBUILD application endpoints.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110611?
CVE-2026-110611 is a medium-severity missing authorization vulnerability in getrebuild rebuild, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
REBUILD through 4.5.0 contains an authorization bypass vulnerability in AiBot2Controller /aibot2 endpoints that act on a caller-supplied chatid without verifying ownership. Authenticated low-privilege users can supply another user's chatid to chat-init, chat-delete, chat-feedback, or chat-stream-stop to read, delete, exfiltrate, or interrupt AI assistant conversations.
Weakness: CWE-639
Which versions are affected by CVE-2026-110611?
How do I fix CVE-2026-110611?
No fix has been published for CVE-2026-110611 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-2026-110611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110611 exists.
Sources
Also known as GHSA-c434-7979-wrg6.