EUVD-2026-330004

fkie_cve-2026-48709

OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0.

GHSA-f637-w7p2-m7fx — OliveTin: ValidateArgumentType API Endpoint's Missing Authentication Allows Action and Argument Enumeration

Affected: Go: github.com/OliveTin/OliveTin

## Summary

The `ValidateArgumentType` RPC endpoint in `service/internal/api/api.go` does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call `auth.UserFromApiCall` or `checkDashboardAccess`. When `AuthRequireGuestsToLogin` is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations.

## Details

### Root Cause

The `ValidateArgumentType` handler at `service/internal/api/api.go:726` has no authentication check:

```go func (api *oliveTinAPI) ValidateArgumentType(ctx ctx.Context, req *connect.Request[apiv1.ValidateArgumentTypeRequest]) (*connect.Response[apiv1.ValidateArgumentTypeResponse], error) { if api.argumentNotFoundForValidation(req.Msg) { return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf("action or argument not found for binding ID %s", req.Msg.BindingId)) }

err := api.validateArgumentTypeInternal(req.Msg) desc := "" if err != nil { desc = err.Error() }

return connect.NewResponse(&apiv1.ValidateArgumentTypeResponse{ Valid: err == nil, Description: desc, }), nil } ```

Compare this with adjacent endpoints that DO have auth checks:

```go // WhoAmI - has auth check func (api *oliveTinAPI) WhoAmI(ctx ctx.Context, req *connect.Request[apiv1.WhoAmIRequest]) ... { user := a…

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EUVD-2026-330004

fkie_cve-2026-48709

GHSA-f637-w7p2-m7fx — OliveTin: ValidateArgumentType API Endpoint's Missing Authentication Allows Action and Argument Enumeration