CVE-2026-79917 MaxKB: Chat share-link endpoint missing owner check: a chat token can publish another user's conversation
Attackers can expose other users' private AI conversations and files by exploiting a missing ownership check in the chat sharing endpoint.
- 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-2026-79917?
CVE-2026-79917 is a medium-severity missing authorization vulnerability in 1Panel-dev MaxKB, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MaxKB is an open-source AI assistant for enterprise. In 2.7.0 through 2.10.4-lts, POST /chat/api/{application_id}/chat/{chat_id}/share_chat verifies that a conversation exists but does not verify that it belongs to the authenticated chat_user_id or to the application bound to the caller's token. An attacker with any chat token and a known victim chat_id can create an unauthenticated public ChatShareLink exposing the victim's conversation and can create PublicFileAccess state that makes associated files retrievable without credentials, with no available revoke path. No fixed version is available as of this review.
Which versions are affected by CVE-2026-79917?
How do I fix CVE-2026-79917?
No fix has been published for CVE-2026-79917 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-2026-79917 being exploited?
There is no known exploitation of CVE-2026-79917 in the wild and no public exploit code.
Sources
Also known as GHSA-m8gr-554p-8r82.