CVE-2026-123271: ChatCLI before v1.215.2 contains an improper validation vulnerability in the MCP OAuth login flow that uses server-suppl

ChatCLI before v1.215.2 contains an improper validation vulnerability in the MCP OAuth login flow that uses server-supplied Protected Resource Metadata as the resource indicator without checking it matches the configured server URL. A malicious MCP server can declare another resource on the same authorization server, obtain the user's bearer token for it, and replay that token against the other resource.