CVE-2026-77516 MaxKB: Missing per-tool authorization in the agent and workflow tool-dispatch path
Low-privilege users can execute unauthorized tools and steal credentials by bypassing per-tool permission checks in the agent dispatch path.
- 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-2026-77516?
CVE-2026-77516 is a medium-severity missing authorization vulnerability in 1Panel-dev MaxKB, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MaxKB is an open-source AI assistant for enterprise. From version 2.0.0 through 2.9.2, a lowest-role workspace member denied access to a tool by WorkspaceUserResourcePermission can still bind its identifier through tool_ids, skill_tool_ids, or mcp_tool_ids and execute it through the agent or workflow dispatch path. The dispatch path does not reapply the per-tool grant enforced by dedicated tool routes, and tool execution decrypts server-side init_params, allowing the caller to receive credentials carried by the denied tool. No fixed version is available as of this review.
Which versions are affected by CVE-2026-77516?
How do I fix CVE-2026-77516?
No fix has been published for CVE-2026-77516 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-2026-77516 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77516 exists.
Sources
Also known as GHSA-383v-fx78-pphm.