MaxKB: Expired application API keys remain usable on `/chat/api/mcp`

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No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

MaxKB is an open-source AI assistant for enterprise. In 2.10.2-lts and earlier, the /chat/api/mcp authentication path looks up an ApplicationApiKey using only its secret and active status, without enforcing the is_permanent and expire_time checks used by the standard chat API. A previously valid, non-permanent application key that remains active after expiration can initialize the MCP endpoint, list the published application's tool metadata, invoke tools/call, and create durable application_chat and application_chat_record state even though /chat/api/open rejects the same key. No fixed version is available as of this review.

Source published

21 Sep 2026 20:26:27 UTC

Source modified

24 Sep 2026 22:42:13 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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CVSS 3.1 · 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N