OAuth MCP login via custom protocol fails on Linux AppImage

Bug Reports
1

Describe the Bug

When using an MCP with OAuth (e.g., Notion) on Linux via AppImage, the cursor:// protocol handler doesn’t successfully authorize the MCP server after completing the OAuth flow.

After the browser completes the flow and attempts to redirect to cursor://…, Cursor opens a blank tab showing the callback URL as plaintext and does not complete the login.

Steps to Reproduce

  1. Download Cursor AppImage and run it on Linux
  2. Register a desktop entry with:
  • MimeType=x-scheme-handler/cursor;
  1. Register an MCP server with OAuth (e.g., Notion)
  2. Cursor displays Needs login
  3. Click login, complete OAuth flow in the browser
  4. Browser tries to open cursor://anysphere.cursor-retrieval/oauth/user/Notion/callback?code=…
  5. Cursor opens a new tab, but does not process or finalize the OAuth login

Expected Behavior

The app should process the cursor://… URL, extract the code, and finish OAuth handshake with the MCP server.

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.3.6
VSCode Version: 1.99.3
Commit: 68b8fe7396ea37d8acdaaaa08ba316ba359a4160
Date: 2025-07-30T18:07:31.095Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.11.0-29-generic

Does this stop you from using Cursor

Yes - Cursor is unusable

2

Thanks for reporting this!

Can you please update to the latest Cursor version and check if it works?

Please let us know if this still happens after updating.