Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M

CVE-2026-77516MaxKB: Missing per-tool authorization in the agent and workflow tool-dispatch path

Medium 5.4

In plain English

A medium-severity authorization bypass via user-controlled key in MaxKB from 1Panel-dev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 84.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
1Panel-dev	MaxKB	>= 2.0.0, <= 2.9.2

Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-383v-fx78-pphm x_refsource_CONFIRM