Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M

CVE-2026-77518MaxKB: Known MCP tool IDs expose owner Tool.code and can be referenced by attacker workflows

Medium 5.0

In plain English

A medium-severity missing authorization 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 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)5.0Medium

Exploit odds (30 days)0.3%top 80.7% 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. In 2.10.2-lts and earlier, a normal workspace user who knows another user's active MCP tool_id in the same workspace can retrieve the hidden tool through the tool-detail route because it does not apply the per-resource authorization used by the list route. The response includes Tool.code, which may contain MCP server configuration and headers, and an attacker who can create or edit an attacker-owned workflow can place the same foreign mcp_tool_id in a workflow mcp-node so workflow debug uses the owner's MCP configuration without verifying permission to use that tool. No fixed version is available as of this review.

Affected products (as reported)

Vendor	Product	Versions
1Panel-dev	MaxKB	<= 2.10.2-lts

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

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-x65c-w438-c58f x_refsource_CONFIRM