Affected: MervinPraison PraisonAI

PraisonAI Platform before 0.1.9 fails to properly authorize label and issue-label mutations, allowing workspace members to rename and recolor shared labels and add or remove labels on owner-created issues. Attackers with workspace member privileges can exploit PATCH and POST/DELETE endpoints to alter shared label taxonomy and manipulate issue-label associations without owner or admin authorization.

Affected: PyPI: praisonai-platform

# Platform members can rewrite shared labels and owner issue labels without owner/admin authorization

## Summary

`praisonai-platform` lets an ordinary workspace member rename and recolor shared labels and add/remove labels on an owner-created issue even though direct label deletion is restricted to workspace admin/owner authority in current releases.

## Technical Details

The affected boundary is the difference between ordinary workspace membership and authority to mutate shared workspace triage taxonomy or owner-created issue workflow state. `src/praisonai-platform/praisonai_platform/api/routes/labels.py` defines `PATCH /workspaces/{workspace_id}/labels/{label_id}` with `user: AuthIdentity = Depends(require_workspace_member)`. The route verifies the label belongs to the URL workspace, then calls `LabelService.update(label_id, body.name, body.color)`, which writes the shared label name/color.

The paired label delete route shows a stricter intended boundary. `DELETE /workspaces/{workspace_id}/labels/{label_id}` also verifies the label belongs to the URL workspace, but then calls `require_delete_permission(workspace_id, user, session)` before deleting. `require_delete_permission()` allows workspace admins/owners, or a supplied `resource_owner_id`; because labels have no per-label owner passed to the helper, direct label deletion is effectively admin/owner-only. The local controls confirm that a normal member receives `403` for direct label deletion in current head, `0.1.6`…